Error in Web service invocation

Hi All

We have a esb process which invokes an web service using Web Service Invocation Step.

It runs fine for most of the time  but we get below error sometimes,especially when we deploy the process into new environment.

Can anybody please explain why me might be getting this error?

com.sonicsw.xq.XQServiceException: (Command was not found associated with this  service or message) (Command was not found associated with this service or  message)
at  com.sonicsw.xqimpl.service.wsinvk.WSInvocationComponent.service(WSInvocationComponent.java:60)
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.ProcessMessageHandler.doHandleMessage(ProcessMessageHandler.java:317)
at  com.sonicsw.xqimpl.service.ProcessMessageHandler.handleMessage(ProcessMessageHandler.java:94)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:422)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToService(MessageSendingHelper.java:330)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:78)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendEnvelopes(MessageSendingHelper.java:926)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:499)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToService(MessageSendingHelper.java:330)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:78)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendEnvelopes(MessageSendingHelper.java:926)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:499)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToService(MessageSendingHelper.java:330)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:78)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendEnvelopes(MessageSendingHelper.java:926)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:499)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToService(MessageSendingHelper.java:330)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:78)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendEnvelopes(MessageSendingHelper.java:926)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:499)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToService(MessageSendingHelper.java:330)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:78)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendEnvelopes(MessageSendingHelper.java:926)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:499)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToService(MessageSendingHelper.java:330)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:78)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToProcess(MessageSendingHelper.java:829)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToProcess(MessageSendingHelper.java:847)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendToAddress(MessageSendingHelper.java:82)
at  com.sonicsw.xqimpl.service.MessageSendingHelper.sendEnvelopes(MessageSendingHelper.java:926)
at  com.sonicsw.xqimpl.service.XQDispatcher.onMessage(XQDispatcher.java:499)
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: com.sonicsw.xqimpl.script.ScriptEngineException: Command was not found  associated with this service or message
at  com.sonicsw.xqimpl.script.ScriptEngine.createScriptFromXQMessage(ScriptEngine.java:221)
at  com.sonicsw.xqimpl.script.ScriptEngine.executeCommand(ScriptEngine.java:60)
at  com.sonicsw.xqimpl.service.wsinvk.WSInvocationComponent.service(WSInvocationComponent.java:37)
...  37 more

Thanks

Chinmay