Correct result not detected for sum_all_numbers challenge

[icefyre127]

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Summary

correct answers not being detected for sum_all_numbers challenge.

Steps to reproduce

If applicable please provide a direct link to the challenge, example: https://cmdchallenge.com/#/sum_all_numbers

I ran the following command:
cat sum-me.txt | perl -e '$sum = 0; while (<>) {$sum += $_;} print $sum'

It correctly prints 42 but is not detected as a correct answer.

I then tried just printing 42 by typing "echo 42". Also not detected.
I cast the result of the perl script into an int but it also had no impact. Not sure why the result is failing.