Our Instance is on Xanadu, and we updated Meraki from 1.3.0 to 1.5.0. We ran into this issue Meraki failing with the same Java error at the top of this Thread: java.lang.IllegalArgumentException: Invalid Entity class for field (name: location, sysid: 8d4ee2901b479610f5cf97d7b04bcb85).........  ServiceNow will tell you it's a 3rd Party App and they don't support it. Meraki support will point finger at ServiceNow. We went back to ServiceNow asking if they can't help us fix it, help us revert to earlier working version. They will tell you 1.3.0 or 1.4.0 can't be install on Xanadu, that isn't quite true. Let me explain: If you were on a previous working version of Meraki before you upgraded to Xanadu; and after Xanadu you updated Meraki to 1.5.0, you can Rollback the Plugin to the earlier working version. You only have 10 days from the time of the Meraki update to do so (unless you have retained version history set for a longer period of time). We were able to successfully Roll Back to 1.3 from the 'Rollback Contexts' Backups (see screenshot 1). If you run the Rollback for Meraki and it fails, look at the end of the message (see screenshot 2). You will then need to Rollback whatever it points to. Attempt to Rollback Meraki again. If it fails again Rollback what it points to this time.... You may have to keep doing this several times, like pealing back an onion. You have to Rollback each plugin the Backup touched until you can successfully Rollback Meraki. We are currently back to running 1.3.0 on Xanadu without issue. I refuse to update Meraki again until this issue is resolved.  1.   2. ... View more