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

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This exception has no message.
java.lang.NullPointerException:
at com.collaxa.cube.engine.types.bpel.CXPartnerLink.copy(CXPartnerLink.java:246)
at com.collaxa.cube.engine.ext.wmp.BPELAssignWMP.performCopyTo(BPELAssignWMP.java:1151)
at com.collaxa.cube.engine.ext.wmp.BPELAssignWMP.__executeStatements(BPELAssignWMP.java:215)
at com.collaxa.cube.engine.ext.wmp.BPELActivityWMP.perform(BPELActivityWMP.java:199)
at com.collaxa.cube.engine.CubeEngine.performActivity(CubeEngine.java:3698)
at com.collaxa.cube.engine.CubeEngine.handleWorkItem(CubeEngine.java:1655)
at com.collaxa.cube.engine.dispatch.message.instance.PerformMessageHandler.handleLocal(PerformMessageHandler.java:75)
at com.collaxa.cube.engine.dispatch.DispatchHelper.handleLocalMessage(DispatchHelper.java:217)
at com.collaxa.cube.engine.dispatch.DispatchHelper.sendMemory(DispatchHelper.java:314)
at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:5765)
at com.collaxa.cube.engine.CubeEngine.callbackPerformer(CubeEngine.java:1885)
at com.collaxa.cube.engine.delivery.DeliveryHelper.callbackPerformer(DeliveryHelper.java:845)
at com.collaxa.cube.engine.delivery.DeliveryService.handleCallback(DeliveryService.java:794)
at com.collaxa.cube.engine.ejb.impl.CubeDeliveryBean.handleCallback(CubeDeliveryBean.java:378)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

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