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>I'm trying to write user-friendly reportying of Lua error.
>want to print stack trace to the screen and also to log file.
>When using code shown below, stack trace do not saved to logfile.
>I'm sure that is because _ERRORMESSAGE does some extra formatting.

_ERRORMESSAGE does not output anything. This is the job of _ALERT. So,
try redefining _ALERT so that it writes to your log file.