<Task object &1 does not exist in system>

What causes this issue?

Task object &V1& (type &V2&) does not exist in the system. The task
displayed in the list of tasks is a placeholder for the original object.
This task cannot be executed and will be skipped during task list
variant or task list run processing.

System Response

How to fix this error?

Contact the task owner. In case the task is provided by SAP, check the
SAP Online Service System for the object name.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.