Hvad betyder denne exception?

Hvad betyder denne exception? Og hvorfor opstår den?
Exception in thread "main" java.lang.IncompatibleClassChangeError
    at org.apache.axis.message.MessageElement.addTextNode(MessageElement.java:1387)
    at org.apache.axis.message.SOAPHandler.endElement(SOAPHandler.java:118)
    at org.apache.axis.encoding.DeserializationContext.endElement(DeserializationContext.java:1083)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:633)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanEndElement(XMLNSDocumentScannerImpl.java:719)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1685)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)
    at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
    at org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:226)
    at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:645)
    at org.apache.axis.Message.getSOAPEnvelope(Message.java:424)
    at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62)
    at org.apache.axis.client.AxisClient.invoke(AxisClient.java:173)
    at org.apache.axis.client.Call.invokeEngine(Call.java:2719)
    at org.apache.axis.client.Call.invoke(Call.java:2702)
    at org.apache.axis.client.Call.invoke(Call.java:2378)
    at org.apache.axis.client.Call.invoke(Call.java:2301)
    at org.apache.axis.client.Call.invoke(Call.java:1758)
    at cvrwebservice.CVRBindingStub.getLegalUnit(Unknown Source)
    at Temp.<init>(Temp.java:70)
    at Webservice.main(Webservice.java:5)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)

Process finished with exit code 1