Errors using Case Merge Premium after Winter '21 release of Salesforce
To overcome these errors, please upgrade to the latest version of Case Merge Premium available in the AppExchange.
You can follow the instructions in the article below:
How Do I Upgrade an AppExchange App?
If after the upgrade you're still facing issues, please open a case with Internet Creations Support and grant us login access, the Org ID and steps to replicate the issue.