"mapping values are not allowed in this context at line xx" when running DelayedJob

Question

One day on my production server with Rails 3.2.13 app DelayedJob stoped working and there was no way to run it again. I haven't made any changes on the server before. When trying to run rake jobs:work I saw error:

mapping values are not allowed in this context at line xx

this error is always connected with parsing some yaml file.

When I was searching for problem I

• restarted my app
• checked for yaml problems
• checked for system problems

and everything seemed to be fine.

Where could be the problem?

Answer 1

Finally I tried to run first job from rails console by DelayedJob.find(x).invoke_job and the problem was in one specific job and its handler description. I remover this one and then started delayed_job without problem. So if you have that kind of problem start searching from your first job in queue.