SQL1131N DARI (Stored Procedure) process has been terminated abnormally.

Got this error when calling a store procedure.
I read from the article that it may be caused by DB2ROUTINE_DEBUG set to ON. Tried issuing 'db2set DB2ROUTINE_DEBUG -all' to get the current setting but got nothing returned. Is this command correct? What is the default value of this parameter?

Any suggestions how to resolve this error would be appreciated.
Thanks in advance!