Job failed in CRON run (7.5)

I added a job to the scheduler which runs every day at 3am.
I tested the job without the scheduler and it works without any problems.
I also configured cron correctly, it starts every day at 3am.
But it never did anything and in the sugar log every day at exactly 3am I can find this:
Job ec328077-2b64-1527-301c-559dc9c02252 (autoImportAccounts) failed in CRON run
Where is the problem?