Create JCo Destination error

Hi gurus,

I have tried to create JCo destination, but got following error. Does anyone tell me how to correct it? The helpful answer will be awarded points. Thank in advance.

The error messages:

com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=sapserver GROUP=SPACE R3NAME=DM0 MSSERV=sapmsDM0 PCS=1 ERROR Group SPACE not found TIME Sat Apr 05 12:05:21 2008 RELEASE 700 COMPONENT LG VERSION 5 RC -6 MODULE lgxx.c LINE 4288 DETAIL LgIGroupX COUNTER 2