S4H Punch out catalog launching with error page

Hi Experts,

In S4H 1610 self service procurement we are configuring some external/punch out catalogs. When we try to launch the catalog we are getting below error:

"The system has encountered an error while trying to process your request. Please try again. If the problem persists, please contact your application administrator."

The same punch out catalog is working from traditional SRM system. In the above scenario we are trying to launch the punch out catalog from SAP FIORI Slef service procurement - Create purchase requistion application.

Apart from SPRO configuration Please let us know if we have any other settings or checks to be done for the punch out catalogs.