Status check &1 does not exist.

What causes this issue?

A check could not be performed because an ABAP class is not available in
your system. This can happen if the class was delivered in a support
package which is not yet installed.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.