Spool request (number &) created without immediate output

What causes this issue?

The "Output immediately" option is not active in your user defaults.
Consequently, the spool request is not output straight away.

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?

You can use Transaction <DS:TRAN.SP02><(>SP02<)></> to print the
request. To ensure that requests are printed immediately in future,
choose System -> User defaults -> Own data and select the "Output
immediately" option.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.