getting unexpected logging error (could not find the language line)

[eluser]introvert[/eluser]
Hello,

I turned on codeigniter logging and I started getting unexpected error in the log files:

"Could not find the language line"

Why am I getting this error?

I do not use any language files in my code.

Anyone has an idea?

Thanks for help

[eluser]toopay[/eluser]
What you did, before you get that error?