[FILE] Process Lines in Text File

I assume you are referring to the macro at the top of this topic:
MACRO: [FILE] Process Lines in Text File

Just to be clear, that button is called "Run Selected Macro"
image

Please be sure you are selecting a TEXT file with multiple lines in it, like this:

qqqq
wwww
weee
errrr
rttttt
yyyyy
uuuu

If you get an error, please make a screenshot of it and post here.

OK, I can help with that, but not in this thread. That is a completely different issue. Please post your comments/issues about the Display Macro Error macro in its topic:
MACRO: [KM] Display Macro Error

But for now, to debug your issue with " [FILE] Process Lines in Text File", don't bother with the "Display Macro Error" macro.