The & class does not exist

What causes this issue?

The specified class does not exist.

System Response

The system issues an error message because it cannot process the
relevant infotype record correctly without the above-named class.

How to fix this error?

Inform your system administrator, who must ensure that the class is
available in your system.

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.