what's the problem?(about jco)

the error information as following:

Server exception occurred: com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNI

CATION: CPIC-CALL: 'SAP_CMACCPTP'

LOCATION CPIC (TCP/IP) on local host

ERROR internal error

TIME Tue Jan 18 01:58:22 2005

RELEASE 640

COMPONENT NI (network interface)

VERSION 37

RC -1

COUNTER 2

###what's the problem?