Hi Murali,
As pointed by some colleagues earlier, the issue is not really with the Launchpad Designer but with the authorizations.
What you can probably try is to see if the sicf services have been activated properly .
This is mentioned in the below link .
Activate SICF Services for SAP Fiori Launchpad - SAP Fiori for SAP Business Suite - SAP Library
I think the issue is with the auth for the service
- /default_host/sap/public/bc/ui5_ui5
If this doesnt help, can you also try launching the Fiori Launchpad runtime and see if you are facing similar issues there?
Best Regards,
Nitish Mehta