Contact person "&1" could not be found

What causes this issue?

Contact person "&V1&" could not be found. This is most likely due to an
input error (misspelled name, for example). If your entry is correct,
this contact person has no user in the system.

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?

Retype your entry.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.