Error occurred inserting &1

What causes this issue?

An internal error occurred when the system tried to insert entries in
table &v1&.
INCLUDE NA_VERBUCH

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?

INCLUDE NA_SYSAD1

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.