Hi Dinesh,
This thread seems to be a duplicated on from "Error in RSTPTEST".
As mentioned, "Error when opening an RFC connection (CPIC-CALL: 'ThCPICArgs'#Illegal CONVID#)." is described on Note
Note 2174439 - Error when opening an RFC connection (CPIC-CALL: 'ThCPICArgs' Illegal CONVID ), pointing to hostname resolution problems.
Take a screenshot from SM59 RFC Destination settings, and perform a Connection Test to see if t works.
Thanks,
Raquel