Hello,
Well, I was writing "assuming that your backend allows scripting"
this error indicates, that the backend has not enabled scripting.
On SAP GUI Scripting page, please refer to Security Considerations
Chapter 3:
"By default SAP GUI Scripting is disabled on any given SAP system. The administrator has to enable the support by setting the profile parameter sapgui/user_scripting to “TRUE” on the application server."
Best regards
Rolf-Martin