Getting null point error while posting contract invoice .

Hi Experts,

We are working on SAP PI 7.1 in production server while posting some invoices we are getting this error .

Any help would be appreciated.Its very urgent.

T9367:prealm_1530:*:*:lfraqu:TaskCXML19620918) (integrationMaster.amfBaseMaster.integrationObjectAdapt

er:WARN) [ID4692]: Message 'PaymentRealTimeExport' invocation encountered following fatal error :'Fault received when processing the

WS exchange : Code: {http://www.w3.org/2003/05/soap-envelope}Receiver, Error: Could not receive fault.. Nested exception is java.la

ng.NullPointerException: null' with the stack trace: {2}

Regards,

Shaik