java.lang.IllegalArgumentException: class cannot be null

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class cannot be null
java.lang.IllegalArgumentException: class cannot be null
at weblogic.xml.schema.binding.internal.TypeMappingBase.get(TypeMappingBase.java:354)
at weblogic.xml.schema.binding.RuntimeUtils.lookup_serializer(RuntimeUtils.java:143)
at weblogic.xml.schema.binding.RuntimeUtils.invoke_serializer(RuntimeUtils.java:183)
at weblogic.xml.schema.binding.RuntimeUtils.invoke_serializer(RuntimeUtils.java:170)
at weblogic.webservice.core.DefaultPart.toXML(DefaultPart.java:248)
at weblogic.webservice.core.DefaultMessage.toXML(DefaultMessage.java:441)
at weblogic.webservice.core.DefaultOperation.invoke(DefaultOperation.java:403)
at weblogic.webservice.core.DefaultOperation.invoke(DefaultOperation.java:359)
at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:416)
at weblogic.webservice.core.rpc.CallImpl.invoke(CallImpl.java:290)
at undefined.JAXRPCWSDL.main(JAXRPCWSDL.java:79)

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