Error when loading case record in Lightning Experience: UNKNOWN_EXCEPTION: An unexpected error occurred. Please include this ErrorId if you contact support
You are attempting to open up an existing case record within the Lightning Experience and encounter an error similar to the following:
This error is related to the following Salesforce Known Issue.
This error may occur if a local field (making reference to a managed package field) is included on your page layout, and the running user has not been assigned a license to that managed package.
Unfortunately, this Salesforce Known Issue is marked with a status of "No Fix," but there are a few options System Administrators can evaluate to avoid this error.
This error is related to the following Salesforce Known Issue, marked with a status of "No Fix".