[USER] Non-zero exitcode

Hello, I am currently trying to create my own run and compare script for the judging system and I got the following message as output.

Non-zero exitcode runtime: s cpu, s wall memory used: bytes ********** runguard stderr follows ********** The exit code is 0

But my both script execute their self correctly and the run script exit with 0 exit code and the compare script exit with the 42 exit code Had I missed something?

Regards Guillaume Milan