Error testing scenario

I am trying to test my scenarios and getting the following error message,does anyone have any clue?

Thanks a lot.....

09/03/03 17:00:51] ID=dev_ESBTest (severe) Trace follows...

com.sonicsw.xq.XQServiceException: Exception whilst preparing executive calls

at com.alphameric.EarlyPricesCES.service(EarlyPricesCES.java:154)

at com.sonicsw.xqimpl.service.debug.DebugServiceInterceptor.intercept(DebugServiceInterceptor.java:118)

at com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper.intercept(XQServiceChain.java:481)

at com.sonicsw.xqimpl.service.XQServiceChain$XQInterceptorServiceWrapper.service(XQServiceChain.java:470)

at com.sonicsw.xqimpl.service.XQServiceChain.service(XQServiceChain.java:151)

at com.sonicsw.xqimpl.service.ServiceMessageHandler.callService(ServiceMessageHandler.java:429)

at com.sonicsw.xqimpl.service.ServiceMessageHandler.handleMessage(ServiceMessageHandler.java:190)

at com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:422)

at com.sonicsw.xqimpl.endpoint.container.EndpointContextContainer.onMessage(EndpointContextContainer.java:90)

at com.sonicsw.xq.connector.jms.JMSEndpoint$JMSEndpointListener.onMessage(JMSEndpoint.java:575)

at progress.message.jimpl.Session.deliver(Session.java:3006)

at progress.message.jimpl.Session.run(Session.java:2397)

at progress.message.jimpl.Session$SessionThread.run(Session.java:2782)

Caused by: java.lang.NullPointerException

at com.alphameric.ExecutiveInstructionGenerator.generateExecCalls(ExecutiveInstructionGenerator.java:47)

at com.alphameric.EarlyPricesCES.service(EarlyPricesCES.java:146)

... 12 more

ID=dev_ESBTest (severe) ServiceMessageHandler for service EarlyPricesCES - XQ_SERVICE_EXCEPTION error processing message: Exception whilst preparing executive calls