We got Concurrent Manager Request error for one of our List Generation request. When we checked the log file (by clicking on view log button),
we got the following message
Troubleshooting and Resolution:
We logged in with the "sysadmin" user and searched the required List Generation request.
And then clicked Diagnostics button, which showed the following message.
When we checked the executable, it was not on the path mentioned. It was a symbolic link to the directoy which was of produciton, as it was the cloned system. We remove the symbolic link, and recreated with the correct path. And this List Generation request worked fine.