Error Codes from Metatrader and MQL and Forex. Solutions.

Description

Error Codes

Error Codes in MetaTrader are crucial for identifying and resolving issues in the platform’s operations. The function GetLastError() retrieves these codes, and constants for these errors are defined in the stderror.mqh file.

To output descriptive text messages, the ErrorDescription() function, located in stdlib.mqh, can be used.

Errors may originate from the trade server or the client terminal.

As a specialist in MT4 and MT5 advisor programming, I frequently receive questions about such errors.

In response, I will explain the most common mistakes made by traders and Expert Advisors, their causes, and how to resolve them.

Every Expert Advisor operates differently, but many issues arise from a common set of problems.

Let’s explore the typical errors and their solutions, following the style of “Guidelines for Electronic Engineering Errors.”

A concise list of these errors can be found in the Error Codes reference, as well as in the MetaTrader 4/MetaTrader 5 terminal. We will use these resources to diagnose and solve problems effectively.

If your error isn’t listed or the suggested solutions don’t work, it’s advisable to contact the author of your Expert Advisor.

Before doing so, however, be sure to review the log files for further details about the issue.

Also i recommend read our FAQ

Some articles may also help you:

1. FAQ: Answers to the most popular questions
2. Testing and Optimization of Expert Advisors
3. How to Install an Expert Advisor

Common Errors and How to Solve Them

Error Number	Brief Description	Possible Causes	Solution Method
Graph Mismatch Errors	Errors on the DC server: incoming ticks are not processed accurately across all timeframes.	1. The DC server inaccurately processes incoming ticks across various timeframes.	1. Testing immediately after loading from the archive does not reveal errors, as only minute data is loaded. Mismatches accumulate when live quotes start arriving.
TestGenerator: Unmatched Data Error	Error in the quotes archive data	1. Incomplete data from your broker 2. Corrupted quote database 3. Testing the EA using outdated data 4. Asynchronous data from older timeframes	An error occurs either when the data mismatch is not defined or when there is none.
Error 0 or 1	No error or the error is unknown	1. Previous unresolved errors from a persistent request	Do not handle errors 0 and 1 in the Expert Advisor.
Error 4, 146 (10022 in MT5)	The broker prohibits the use of an order expiration date	1. The trade server is busy 2. You have set the wrong expiration type of the pending order (order cancellation time)	1. Restart the terminal Optimize the EA code with better error handling functions 2. StopOrderDayToExpiration: – 0 – ORDER_TIME_GTC The order will be in the queue until it is removed ; – 1 – ORDER_TIME_DAY The order will be valid only for the current trading day;  – X – ORDER_TIME_SPECIFIED The order will remain valid until the expiry date.  or StopOrderBarToExpiration
Error 8, 141 (10024 in MT5)	Too Frequent Requests	1. The EA sends too many orders simultaneously 2. The EA does not wait for a server response before sending a new order, causing server overload	1. Ensure the EA waits for responses before sending additional orders. 2. Expert Advisor has sent too many requests. Please wait a bit and continue working with Expert Advisor.
Error 130, 145 (10016 in MT5)	Incorrect Stop Levels Specified	Stop levels (StopLoss, TakeProfit) are too close to the current price	1. Verify the opening rules with your broker for Minimal StopLevel 2. Ensure stop levels comply with your account and broker’s specifications 3. You can use our function: SetMinStops – Automatically normalize all parameters of the Expert Advisor to the minimum acceptable stop levels.  4. Please set higher level of Stop parametrs StopLoss, TakeProfit, TrailingStop, Order Distance ….
Error 132 (10018 in MT5)	The Market is Closed	The market is closed, usually on weekends	Try placing the trade after the market reopens. To trade in weekends you can try our TesterPad
Error 133 (10017 in MT5)	Trading is Prohibited	1. Trading is currently restricted 2. Trading is prohibited for the selected currency pair	1. Wait for trading to resume 2. Try trading a different currency pair or check if a suffix is required for your pair
Error 134 (10019 in MT5)	Not Enough Funds to Complete the Transaction	1. The lot size you are trying to open is too large, leading to insufficient margin	1. Check your free margin 2. Calculate the necessary funds for the desired lot size before opening the position 3. Check your trading lot settings (Lot, Autolot, DynamicLot, Martin)
Error 135–138 (10004, 10006, 10020 in MT5)	The Price Has Changed	1. Requote occurred 2. Market volatility 3. Broker does not allow trades at the stated price	1. Avoid trading during volatile market periods 2. Increase slippage, but be aware that this may result in trades executed at different prices 3. This is a standard mistake of the fast market.
Error 147	ERR TRADE EXPIRATION DENIED	The EA or user attempts to set a pending order expiration date	Set the expiration date to 0 in the OrderSend function of the EA. The use of order expiration date is prohibited by the broker
Error 148 (10033 in MT5)	Maximum Open or Pending Orders Reached	The maximum limit of open orders or pending positions has been reached	Check your broker’s limit for open orders and adjust your trading strategy accordingly.
Error 4012, 4013	Division by Zero Zero Devide	1. The EA attempts to divide by zero in its calculations 2. MarketInfo(Symbol(), MODE_SPREAD) may return zero for brokers with floating spreads	Check the EA code to prevent division by zero and ensure proper handling of MarketInfo responses.
Error 4017	DLL Call Not Allowed	Calling a DLL is prohibited by the terminal or antivirus software	1. Allow DLL calls through the terminal settings 2. Ensure the DLL is safe using antivirus software before enabling it
Error 4106	Unknown Symbol	The symbol is not listed in the Market Watch	Enable the symbol in Market Watch or request it from your broker.
Error 4108 (10036 in MT5)	Invalid Ticket Number	The order’s ticket number no longer exists The order may have been closed manually or by another EA	Avoid manual intervention in EA-managed orders and disable conflicting EAs. Perhaps the Expert Advisor is trying to close or modify an order that has already been closed by another Expert Advisor.
Error 4110, 4111 (10042,10043,10044 in MT5)	Long/Short Positions Not Allowed	The EA settings restrict certain trade types Server limit type of position	Adjust the settings in the General tab to allow the desired trade types (Long & Short, Only Long, Only Short for MT4 only). Ask your broker
Error 10030	TRADE RETCODE INVALID FILL	Incorrect filling of orders.	Set the parameter in the Expert Advisor settings TypeFilling The type of fill positions and orders.  It is used for the MT5 terminal.  In AUTO mode, the Expert Advisor tries to determine the fill type automatically.  But, in some situations, you need to set the fill type yourself.

TRADE ERROR CODES

Error Codes Returned from the Trade Server

The Code	Identifier	Description	Solution Method
10004	TRADE_RETCODE_REQUOTE	Requote	Increase the slippage level or avoid trading during high volatility periods. Slippage The level of the maximum possible deviation in price when opening and closing positions (in Points).
10006	TRADE_RETCODE_REJECT	Request Denied	Check the trade conditions and account status, and retry the request later.
10007	TRADE_RETCODE_CANCEL	Request Canceled by Trader	Ensure that no manual cancellation is occurring or adjust the EA settings.
10008	TRADE_RETCODE_PLACED	Order Placed	No action required. This is a confirmation message.
10009	TRADE_RETCODE_DONE	Application Completed	No action required. The request has been successfully completed.
10010	TRADE_RETCODE_DONE_PARTIAL	Application Partially Completed	Check the remaining order and complete it manually if necessary.
10011	TRADE_RETCODE_ERROR	Request Processing Error	Review the logs to identify the error and retry the request after correction.
10012	TRADE_RETCODE_TIMEOUT	Request Canceled Due to Timeout	Increase the timeout period or retry during periods of lower server load.
10013	TRADE_RETCODE_INVALID	Bad Request	Check the request parameters and retry with correct values.
10014	TRADE_RETCODE_INVALID_VOLUME	Incorrect Volume in the Request	Ensure the trade volume is within the allowable limits for the account.
10015	TRADE_RETCODE_INVALID_PRICE	Wrong Price in the Request	Check the market price and retry with the correct one.
10016	TRADE_RETCODE_INVALID_STOPS	Wrong Stops in the Request	Ensure that the StopLoss and TakeProfit values comply with broker rules. SetMinStops Automatically normalize all parameters of the Expert Advisor to the minimum acceptable stop levels.
10017	TRADE_RETCODE_TRADE_DISABLED	Trade Prohibited	Check the trading conditions on the account and broker’s restrictions.
10018	TRADE_RETCODE_MARKET_CLOSED	The Market is Closed	Wait until the market reopens to place a trade. To trade in weekends you can try our TesterPad
10019	TRADE_RETCODE_NO_MONEY	Not Enough Funds to Fulfill the Request	Ensure sufficient funds in the account or reduce the trade size.
10020	TRADE_RETCODE_PRICE_CHANGED	Prices Have Changed	Retry the request with the updated price or increase slippage allowance.
10021	TRADE_RETCODE_PRICE_OFF	No Quotes to Process Request	Wait for the market to provide quotes and retry the request.
10022	TRADE_RETCODE_INVALID_EXPIRATION	Invalid Order Expiration Date in the Request	Set the correct expiration date or leave it blank for immediate orders. StopOrderDay ToExpiration = number of days for the order expiration.
10023	TRADE_RETCODE_ORDER_CHANGED	Order Status Has Changed	Update the order status and retry the request with the correct information.
10024	TRADE_RETCODE_TOO_MANY_REQUESTS	Too Frequent Requests	Limit the number of requests per second to avoid overloading the server.
10025	TRADE_RETCODE_NO_CHANGES	No Changes in the Request	Ensure there are actual changes before resubmitting the request.
10026	TRADE_RETCODE_SERVER_DISABLES_AT		Ask your broker
10027	TRADE_RETCODE_CLIENT_DISABLES_AT	The Client Terminal Prohibits Auto Trading	Enable auto trading in the terminal settings to proceed with trades.
10028	TRADE_RETCODE_LOCKED	There is Already a Closing Order for the Specified Position. It May Occur When Working in a Hedging System Request Blocked for Processing	Wait for the current closing order to process before submitting another. Check for locked orders or system restrictions and resolve the issue.
10029	TRADE_RETCODE_FROZEN	Order or Position is Frozen	Contact your broker to understand why the position is frozen.
10030	TRADE_RETCODE_INVALID_FILL	An Unsupported Order Execution Type by Balance was Specified	Ensure the correct order execution type is chosen for your balance. TypeFilling The type of fill positions and orders.  It is used for the MT5 terminal.  In AUTO mode, the Expert Advisor tries to determine the fill type automatically.  But, in some situations, you need to set the fill type yourself.
10031	TRADE_RETCODE_CONNECTION	The Request to Activate a Pending Order was Rejected, and the Order Itself was Canceled	Check the connection to the server and retry the request.
10032	TRADE_RETCODE_ONLY_REAL	The Operation is Allowed Only for Real Accounts	Ensure the operation is being conducted on a real account, not a demo account.
10033	TRADE_RETCODE_LIMIT_ORDERS	The Limit on the Number of Pending Orders has Been Reached	Reduce the number of pending orders or contact the broker for adjustments.
10034	TRADE_RETCODE_LIMIT_VOLUME	The Limit on the Volume of Orders and Positions for This Symbol has Been Reached	Reduce the trade volume or contact the broker for adjustments.
10035	TRADE_RETCODE_INVALID_ORDER	Invalid or Prohibited Order Type	Check the allowed order types for the broker and retry with a valid type.
10036	TRADE_RETCODE_POSITION_CLOSED	Position with Specified POSITION_IDENTIFIER is Already Closed	No action needed. The position has already been closed.
10038	TRADE_RETCODE_INVALID_CLOSE_VOLUME	Closed Volume Exceeds Current Position Volume	Ensure the volume to close does not exceed the current position size.
10039	TRADE_RETCODE_CLOSE_ORDER_EXIST	No Connection to the Trade Server	Check the connection and reattempt once the server is reachable.
10040	TRADE_RETCODE_LIMIT_POSITIONS	The Request was Rejected Because the Symbol is Set to the Rule “You Can Only Close Existing Positions.”	Close existing positions before attempting new ones.
10041	TRADE_RETCODE_REJECT_CANCEL	The Request was Rejected Because the Symbol is Set to the Rule “You Can Only Close Existing Positions.”	Adjust the trade to comply with the “close-only” rule.
10042	TRADE_RETCODE_LONG_ONLY	The Request was Rejected Because the Rule “Only Long Positions Allowed” is Set on the Symbol	Only long positions are allowed for this symbol; avoid submitting short trades.
10043	TRADE_RETCODE_SHORT_ONLY	The Request was Rejected Because the Rule “Only Short Positions Allowed” is Set on the Symbol	Only short positions are allowed for this symbol; avoid submitting long trades.
10044	TRADE_RETCODE_CLOSE_ONLY	The Request was Rejected Because the Symbol is Set to the Rule “You Can Only Close Existing Positions”	Comply with the “close-only” rule by closing positions instead of opening new ones.

Other Errors

Error Code	Error Number	Description	Solution Method
ERR_SUCCESS	0	Operation Completed Successfully	No action required.
ERR_INTERNAL_ERROR	4001	Unexpected Internal Error	Check for system or program conflicts and restart the terminal.
ERR_WRONG_INTERNAL_PARAMETER	4002	The Structure Contains Invalid Objects Like Strings, Dynamic Arrays, or Unsupported Structures	Review the structure of the objects and ensure they are properly defined.
ERR_INVALID_PARAMETER	4003	Wrong Parameter When Calling a System Function	Verify the function’s parameters and ensure they match the required format.
ERR_NOT_ENOUGH_MEMORY	4004	Not Enough Memory to Execute a System Function	Free up system memory or optimize the program to use less memory.
ERR_STRUCT_WITHOBJECTS_ORCLASS	4005	Not Enough Memory to Reallocate the String	Check for memory leaks and optimize the program’s memory usage.
ERR_INVALID_ARRAY	4006	An Array of the Wrong Type, Size, or a Broken Dynamic Array Object	Ensure the array is correctly defined and initialized before use.
ERR_ARRAY_RESIZE_ERROR	4007	The Requested Array Size Exceeds 2 Gigabytes	Reduce the array size or manage memory allocation more efficiently.
ERR_STRING_RESIZE_ERROR	4008	The Requested History was Not Found	Ensure the requested history is available or adjust the request parameters.
ERR_NOTINITIALIZED_STRING	4009	Uninitialized String	Initialize the string before attempting to use it in operations.
ERR_INVALID_DATETIME	4010	Wrong Date and/or Time Value	Verify the date and time format in the request and retry.
ERR_ARRAY_BAD_SIZE	4011	Mismatched Dynamic and Static Resources	Ensure the array sizes are compatible and correctly initialized.
ERR_INVALID_POINTER	4012	Wrong Pointer	Check the pointer value and ensure it’s valid before use.
ERR_INVALID_POINTER_TYPE	4013	Wrong Pointer Type	Ensure the pointer is of the correct type and properly cast.
ERR_FUNCTION_NOT_ALLOWED	4014	System Function Not Allowed to be Called	Review system restrictions and confirm the function can be executed.
ERR_RESOURCE_NAME_DUPLICATED	4015	Duplicate Resource Name	Use unique resource names to avoid conflicts.
ERR_RESOURCE_NOT_FOUND	4016	No Resource Found with the Specified Name	Ensure the resource exists in the correct directory or file.
ERR_RESOURCE_UNSUPPOTED_TYPE	4017	Unsupported Resource Type or Size Exceeds 16 MB	Use supported resource types and ensure the size is under the limit.
ERR_RESOURCE_NAME_IS_TOO_LONG	4018	Resource Name Exceeds 63 Characters	Shorten the resource name to meet the character limit.
ERR_MATH_OVERFLOW	4019	Overflow Occurred While Evaluating a Math Function	Check the function inputs and use smaller values to prevent overflow.
ERR_CHART_WRONG_ID	4101	Wrong Chart ID	Verify the chart ID and ensure it’s correct before using it.
ERR_CHART_NO_REPLY	4102	Chart Not Responding	Check for system or connection issues and restart the terminal if necessary.
ERR_CHART_NOT_FOUND	4103	Chart Not Found	Ensure the chart is open and accessible before attempting operations.
ERR_CHART_NO_EXPERT	4104	No Expert is Available to Process the Event on the Chart	Attach the necessary Expert Advisor (EA) to the chart to handle events.
ERR_CHART_CANNOT_OPEN	4105	Chart Opening Error	Check for system errors and retry opening the chart.
ERR_CHART_CANNOT_CHANGE	4106	Error Changing Symbol or Period on the Chart	Ensure the chart is accessible and that the requested symbol or period is valid.
ERR_CHART_WRONG_PARAMETER	4107	Wrong Parameter Value for the Chart Function	Verify the parameters being passed to the chart function and retry.
ERR_CHART_CANNOT_CREATE_TIMER	4108	Error Creating Chart Timer	Check the system settings and ensure the terminal allows timer creation.
ERR_CHART_WRONG_PROPERTY	4109	Wrong Chart Property ID	Use the correct property ID for chart operations.
ERR_CHART_SCREENSHOT_FAILED	4110	Error Taking a Screenshot	Ensure the terminal has sufficient permissions and storage space to save the screenshot.
ERR_CHART_NAVIGATE_FAILED	4111	Chart Navigation Error	Ensure the chart is loaded correctly and that navigation commands are valid.
ERR_CHART_TEMPLATE_FAILED	4112	Error Applying Template	Ensure the template exists and is compatible with the chart.
ERR_CHART_WINDOW_NOT_FOUND	4113	The Subwindow Containing the Specified Indicator was Not Found	Check if the indicator is applied to the correct window.
ERR_CHART_INDICATOR_CANNOT_ADD	4114	Error Adding an Indicator to a Chart	Ensure the indicator is valid and supported by the chart.
ERR_CHART_INDICATOR_CANNOT_DEL	4115	Error Deleting an Indicator from a Chart	Ensure the indicator exists on the chart before attempting to delete it.
ERR_CHART_INDICATOR_NOT_FOUND	4116	The Indicator was Not Found on the Specified Chart	Verify the chart and indicator parameters and retry.
ERR_OBJECT_ERROR	4201	The Terminal Settings Limit the Number of Requested Bars	Increase the number of bars allowed in the terminal settings.
ERR_OBJECT_NOT_FOUND	4202	Graphic Object Not Found	Ensure the graphic object exists and is correctly defined.
ERR_OBJECT_WRONG_PROPERTY	4203	Wrong Graphic Object Property Identifier	Use the correct property identifier for graphic object operations.
ERR_OBJECT_GETDATE_FAILED	4204	Access to History Failed	Check the history access permissions and retry the request.
ERR_OBJECT_GETVALUE_FAILED	4205	Unable to Get Value Corresponding to Date	Verify the date range and ensure the history data is available.
ERR_MARKET_UNKNOWN_SYMBOL	4301	Unknown Symbol	Ensure the symbol exists in the Market Watch and is spelled correctly.
ERR_MARKET_NOT_SELECTED	4302	Symbol Not Selected in Market Watch	Select the symbol in Market Watch and retry the operation.
ERR_MARKET_WRONG_PROPERTY	4303	Wrong Symbol Property Identifier	Verify the property identifier and retry the operation.
ERR_MARKET_LASTTIME_UNKNOWN	4304	The Time of the Last Tick is Unknown (There Were No Ticks)	Wait for a tick to arrive and retry the request.
ERR_MARKET_SELECT_ERROR	4305	Error Adding or Removing Symbol in Market Watch	Check for system errors and retry adding or removing the symbol.
ERR_HISTORY_NOT_FOUND	4401	Many Errors Occurred When Loading History	Check for corrupted history data and reload the history if necessary.
ERR_HISTORY_WRONG_PROPERTY	4402	Incorrect History Property Identifier	Use the correct property identifier for history operations.
ERR_HISTORY_TIMEOUT	4403	Timeout Exceeded When Requesting History	Increase the timeout limit or retry during periods of lower system load.
ERR_GLOBALVARIABLE_NOT_FOUND	4501	Client Terminal Global Variable Not Found	Ensure the global variable exists before attempting to use it.
ERR_GLOBALVARIABLE_EXISTS	4502	Global Variable Already Exists	Use a unique name for global variables to avoid conflicts.
ERR_GLOBALVARIABLE_NOT_MODIFIED	4503	No Modifications Were Made to the Global Variable	Ensure the global variable is modified before attempting to update it.
ERR_GLOBALVARIABLE_CANNOTREAD	4504	Failed to Read Global Variable Value	Check file permissions and ensure the global variable is accessible.
ERR_GLOBALVARIABLE_CANNOTWRITE	4505	Failed to Write Global Variable Value	Ensure there is sufficient permission and storage space to write the file.
ERR_MAIL_SEND_FAILED	4510	Failed to Send an Email	Check email server settings and ensure the email address is correct.
ERR_PLAY_SOUND_FAILED	4511	Failed to Play Sound	Ensure the sound file exists and the system can access it.
ERR_FTP_SEND_FAILED	4514	No FTP Server is Specified	Ensure the FTP server details are entered correctly and retry.
ERR_NOTIFICATION_SEND_FAILED	4515	Failed to Send Notification	Verify the notification settings and ensure they are correctly configured.
ERR_BUFFERS_NO_MEMORY	4601	Not Enough Memory to Allocate Indicator Buffers	Free up memory or optimize buffer usage in the program.
ERR_ACCOUNT_WRONG_PROPERTY	4701	Wrong Account Property ID	Ensure the correct account property ID is being used.
ERR_TRADE_DISABLED	4752	Trading for an Expert is Prohibited	Enable trading permissions for the Expert Advisor in the terminal.
ERR_TRADE_POSITION_NOT_FOUND	4753	Position Not Found	Verify the position details and ensure it exists before attempting operations.
ERR_TRADE_ORDER_NOT_FOUND	4754	Order Not Found	Verify the order ID and ensure it exists before attempting operations.

MARKET MQL5 Errors

Market MQL5. Problem and errors with installing Expert Advisor and solutions

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