Cron Job Broken

[OcR Envy]

I've written a custom cron job to interact with a mod I am working on. However the cron job doesn't work every time. If I run it manually it works without any problem, however it doesn't seem to run automatically despite the scheduled task manager showing it ran.

Is there some kind of error in my coding that would cause this? I'm reluctant to post the code but will if needed.