config.xml testScript.sh Each time my build runs, PostBuildScript is saying there is an error (project names redacted): 

[PostBuildScript] - Executing post build scripts.
[PostBuildScript] - Executing the script /var/lib/jenkins/workspace/<project>/<module>/mvp-contexts/updateVms.sh with parameters [/var/lib/jenkins/workspace/<project>].
[MCP] $  /bin/bash /tmp/jenkins4164249000057985231.sh /var/lib/jenkins/workspace/<project>
[PostBuildScript] - [ERROR] Problem occurred: Error while executing script
Build step 'Execute Scripts' changed build result to FAILURE
Build step 'Execute Scripts' marked build as failure

But if I SSH into the Jenkins machine and su to the Jenkins user, I can copy that command from the [MCP] line and run it just fine.

I've tried it with just a hello world echo statement in the script with the same result.

The parameter is workspace project location so the script can reference workspace files.

EDIT

I think I've figured it out. If there is a space after the shebang (#!) in the script, it fails in the plugin, but running the command from the log output works. I've attached my config.xml and testScript.sh for reproducing the bug.