When deploying or restoring PermissionSetAssignements to Salesforce, you may encounter an error that reads:

This article explains why these errors occur, and how to resolve it.

This error message indicates that you are trying to assign a permission set to a user that is inactive.

The solution to this error is to either remove the problem records from the deployment, or to reactivate the users on Salesforce.

If you are restoring a backup, Gearset may be able to fix this issue for you using our data problem analyzers, which will remove the records from the restore.