error in Moni

HI,

ARIBA  to ECC ( order confirmation interface) we are getting some null error in PRD .

"Thrown: java.lang.NullPointerException: null at com.sap.guid.GUID.parseHexGUID(GUID.java:1046) at com.sap.guid.GUIDGenerator.parseHexGUID

(GUIDGenerator.java:111) at com.sap.aii.utilxi.misc.api~ ".

how to resolve this.

if i execute payload message in mapping test tab no error found.

Please suggest me how to resolve this issue .

thanks,

Satya .