Internal error when accessing the Knowledge Provider. Error code &1

What causes this issue?

An error occurred while storing the document.

System Response

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

How to fix this error?

Check the settings of the content repository that is used by the <AB>ATF
</>document area.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.