Upgrading Action Pack results in error

Document ID : KB000094169
Last Modified Date : 16/05/2018
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Attempting to upgrade an Action pack through the plugin manager results in the follow error:

Object 'XXX' is still active in the Activities Queue.

This indicates that the package cannot upgrade because there are still existing executions that are active. 
Search for the object name -> Executions -> Make sure no executions for that object are active. Cancel or wait until the execution end of the objects, and then the upgrade of the pack should work successfully.