Error Checking Production Access Code--Access code is Invalid or Expired
The active license key has a problem with your executable--this may be from a timing issue with your renewals and the timestamp of your FlyServer.exe -- you cannot use an executable that is newer than the expiration of your last Maintenance and Support period.
If you have a subscription license and have renewed your Subscription, you need to Refresh your license following the directions in the link below.
Using the directions in How to Activate/Refresh License Key / Access Code -- don't update the active code, but click on the Check Subscription or Check Maintenance...if the FVLicense.exe shows that the license is OK, then restart the Inventu Viewer Service and see if that fixes the issue.
If your Inventu Viewer Service continues to not start due to this error, please open a Support Ticket to further diagnose the problem.
