Internal error during rule processing

What causes this issue?

An internal error has occurred during rule determination.
&v1& &v2& &v3& &v4&

System Response

Processing is terminated.

How to fix this error?

This is probably a program error.

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.