MQL5 Documentation errors, defaults or inconsistencies. - page 5

[Alain Verleyen]

@Rashid Umarov

ChartScreenshot() is not working in the Strategy Tester. It would be nice to add a word about it in the documentation : https://www.mql5.com/en/docs/chart_operations/chartscreenshot

And also to update the list of functions not working in the Tester : https://www.mql5.com/en/docs/runtime/testing#function_limitations

And finally to return an error : currently the function doesn't do anything silently.

ERR_FUNCTION_NOT_ALLOWED

4014

Function is not allowed for call

[Alain Verleyen]

Forum on trading, automated trading systems and testing trading strategies

MetaTrader 5 Platform Update Build 5660: Improvements and Fixes

Vladislav Boyko, 2026.03.29 14:40

In the documentation, the parameter is of type int:

In the editor, the parameter is of type unit:

And the parameter name doesn't match.

[Alain Verleyen]

Forum on trading, automated trading systems and testing trading strategies

Wrong error code description in documentation

Dominik Egert, 2026.05.05 09:33

Error code 5402 is returned by CalendarEventById() function, if the event ID is "invalid".

This error is documented as 

ERR_CALENDAR_NO_DATA

5402

Country is not found

I suspect, the error description is misleading. - This function is not even capable of verifying country ID. The event ID is non-existant, therefore it is not capable of even evaluating the country itself.

A better description of the error code would be: "No data found in calendar database".