File & cannot be generated

What causes this issue?

A file cannot be created for the specified &V1& name.

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?

Check the entries on the selection screen.
If you require a letter on the presentation server, then you must enter
a corresponding file name (drive, path, file).

Error message extract from SAP system. Copyright SAP SE.