Rfc of "SUBST_GET_UVERS" failed in prepare state

Hi,

i am faceing error in prepare state it shows the following error

ERROR: Rfc of "SUBST_GET_UVERS" failed

Key: RFC_ERROR_SYSTEM_FAILURE

I check the DDIC password in 000 it is fine..

and i applyed latest kernal patch also

could you please give me the solution for this errore