Path name contains invalid character: &1.

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

The path name entered does not correspond to the conventions.
It contains invalid characters. Do not use special characters in folder
names.
Use the characters '\' or '/' to separate directories. Do not insert
spaces before or after the separators.
Do not use double characters ('//' '\/' '/\' '\\' ).

System Response

How to fix this error?

Enter a valid path name.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.