Error occurred while downloading data (&1, return code &2)

What causes this issue?

While downloading the data, an error occurred which shows the parameter
&V1& and the return code &V2&.

System Response

Data was not transferred correctly.

How to fix this error?

First, using the error parameter &V1& and/or the return code &V2&, try
to find a hint on the cause of the error in the documentation for
function module GUI_DOWNLOAD (transaction SE37).
If that is not possible, please notify SAP.

Procedure for System Administrators

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.