Hello Kapil,
Can you please confirm if the dump occurs only during creation or while you display as well?
If the URL mentioned in the BSP error points to /bc/bsp/sap/crm_ui_frame/[file name] and if the attachment in the activity points to the service CRM_ATT_PROVIDE. Then kindly implement
the note
https://service.sap.com/sap/support/notes/1699441
and clear IE & ICM cache before testing.
To clear the ICM cache use
Tx. SMICM, menu Goto->HTTP Server Cache->Invalidate->Global in system
To clear the IE cache,
IE->menu Tools->Internet Options->tab General->button Delete
Regards,
Reshma Rao