mql5-skills/skills/mql5/references/docs/01-constants/0187-constants-errorswarnings.md

Codes of Errors and Warnings

This section contains the following descriptions:

• Return codes of the trade server – analyzing results of the trade request sent by function OrderSend();
• Compiler warnings – codes of warning messages that appear at compilation (not errors);
• Compilation errors – codes of error messages at an unsuccessful attempt to compile;
• Runtime errors – error codes in the execution of mql5-programs, which can be obtained using the GetLastError() function.