Internal error in Data Warehousing Workbench

What causes this issue?

An internal error occurred. The system has an inconsistent runtime
state.

System Response

The system terminates data processing or tries to reinstate the last
correct system state.

How to fix this error?

Search for SAP Notes describing this symptom or contact SAP.

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.