DSXchange

I am facing an error which I have never faced before. I am mainly getting this error in load and extraction job. Database here is DB2.
First it gives a Warning :
The environment variable DB2INSTANCE is currently set to `dsadm'
and is being changed to `bcuaix' as specified in the server option;
if this instance is a different version of DB2, the program may not succeed.


Then the ERROR :

main_program: Internal Error: (k == numNodes): db2partutils.C: 772
Traceback: pureAssertion__13APT_FatalPathFPCcT1i() at 0x9000000022600d8
groupNodes__11APT_DB2InfoFPCUsT1P12APT_DB2UtilsP12APT_ErrorLogT1() at 0x900000009bb732c
getTableDB2NodeMap__12APT_DB2UtilsFPCUsPP8APT_NodePiPP14APT_DB2NodeSetP12APT_ErrorLogT1() at 0x900000009bb7c50
describeOperator__20APT_DB2WriteOperatorFv() at 0x900000009c128dc
wrapDescribeOperator__15APT_OperatorRepFv() at 0x9000000015ffdd4
check1a__15APT_OperatorRepFv() at 0x9000000016014a4
sequenceAndCheck1Operators__11APT_StepRepFR12APT_ErrorLog() at 0x900000001863a88
check__11APT_StepRepFv() at 0x9000000018635b0
check__8APT_StepFv() at 0x90000000185a6a8
createAndCheckStep__7APT_OSLFP20APT_OSL_SIL_StepSpecR12APT_ErrorLog() at 0x900000007e86804
.() at 0x1000069e8
APT_PMconductorMain__FPFiPPc_i() at 0x900000001bd7240
APT_SharedMain__FiPPcPFiPPc_i() at 0x900000001bd5a1c
.() at 0x10000ea74


Any help is highly appreciated....