We're experiencing the same issue since we upgraded to Jenkins 1.509.31 & Folders 3.14 & Folders Plus 1.8. I can't seem to find a work-around that works for us - if we're trying to copy artifacts from the workspace of the last successful build of a different project that ran on another build node, I'm not sure how I can set an absolute path.
Say the complete tree that I want to get artifacts from is:
I'm currently here:
Under "Copy Artifacts From Another Project" we had:
"BottomA" entered, and "Copy from WORKSPACE of latest completed build".
We got the exception above (about not being able to cast to hudson.model.Job).
I changed it to "/Top/Middle/BottomA" and it still errored.
Any ideas? If not, is there a version we can fall back to?
UPDATE: It was the next copy artifact task that was failing; it was "TopC/MiddleC/BottomC" and I put a / in front of it and now we're working. Thanks!