You were already given the answer. You get that error because you don't have the Path::Tiny module installed.

Note that you do not need Path::Tiny, or any module, to read in the lines from a file, or to "clear the contents of the file." You can do it without additional modules, including by using Perl's built-int truncate function, as roboticus told you in the first response to your question.

The way forward always starts with a minimal test.

In reply to Re^7: Clear the contents of the text file by 1nickt
in thread Clear the contents of the text file by shroh

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