Sorry for the trouble right when you’re getting started, it sounds like the just in time build that ran on one of your earlier deployments is in a strange state. I would try restarting OttoFMS on your source server and rerunning your deployment.
Restarting OttoFMS will clear any file locks and clean up any orphaned Just In Time build in the outbox, which should clean up your state and let you run the deployment without issue.
Same exact issue, I restarted OttoFms from the console, also we have had OttoFMS running for an year so it’s not an new install. I am not the original person that installed/configured and trying to keep up (in an manner of speaking).
Thank you that solved the issue. Running on Windows Server, I had to go into Services and disable OttoFMS, delete the JIT File then restart otherwise deleting without stopping the service the file would reappear.