java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.mule.module.cxf.CxfInboundMessageProcessor$1.write(CxfInboundMessageProcessor.java:423)
at org.mule.transformer.simple.ObjectToByteArray.doTransform(ObjectToByteArray.java:63)
at org.mule.transformer.AbstractTransformer.transform(AbstractTransformer.java:420)
at org.mule.DefaultMuleMessage.getPayload(DefaultMuleMessage.java:377)
at org.mule.DefaultMuleMessage.getPayload(DefaultMuleMessage.java:325)
at org.mule.DefaultMuleMessage.getPayloadAsBytes(DefaultMuleMessage.java:615)
at org.mule.module.http.internal.listener.HttpResponseBuilder.build(HttpResponseBuilder.java:159)

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