License server error 500

[ianc225]

I am trying to set up a new Synology 225+ NAS to replace an older model. Both drives are attached to my Mac. I didn't uninstall MinimServer from the older drive before installing to the 225+. This may have caused the following error message:
License server error 500: [d0432f0a] [8] Undefined index: ukey in file /home/jminimco/minimworld/activate-license-2.2g3.php on line 2998; resetting to Starter Edition
I've tried the suggested remedy of deleting the minimserver-starter.license file, the minimserver.license file wasn't present. The error message was still present following a restart.