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java.lang.NullPointerException: 	at org.apache.axis2.client.Stub.cleanup(Stub.java:134)	at com.opensys.cloveretl.component.WebServiceClient.free(Unknown Source)	at org.jetel.graph.Phase.free(Phase.java:487)	at org.jetel.graph.TransformationGraph.freeResources(TransformationGraph.java:681)	at org.jetel.graph.TransformationGraph.free(TransformationGraph.java:955)	at org.jetel.graph.runtime.PrimitiveAuthorityProxy.executeGraph(PrimitiveAuthorityProxy.java:149)	at org.jetel.component.RunGraph.runGraphThisInstance(RunGraph.java:511)	at org.jetel.component.RunGraph.runSingleGraph(RunGraph.java:409)	at org.jetel.component.RunGraph.execute(RunGraph.java:302)	at org.jetel.graph.Node.run(Node.java:414)	at java.lang.Thread.run(Thread.java:619)