how to remove java invalod class exception error

hi
i am gettin this error when i am running my junit test case  calling  an ejb from other server
weblogic.rjvm.PeerGoneException: ; nested exception is:
      java.rmi.UnmarshalException: Incoming message header or abbreviation processing failed ; nested exception is:
      java.io.InvalidClassException: tavant.platform.exceptions.TavantException; local class incompatible: stream classdesc serialVersionUID = 5065039219355259376, local class serialVersionUID = -2057261135792908592
      at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundRequest.java:108)
      at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:284)
      at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:244)
      at com.tavant.resolve.reo.app.prepareasset.propertyvaluation.facade.PropertyValuationFacadeBean_j6vvb4_EOImpl_813_WLStub.getOrderWithVersions(Unknown Source)
      at com.tavant.resolve.repair.web.repairrequest.delegate.ReviewPropCondDelegate.loadVersionsData(ReviewPropCondDelegate.java:88)
      at com.tavant.resolve.repair.web.repairrequest.controller.ReviewPropCondAction.loadVersionsData(ReviewPropCondAction.java:452)
      at com.tavant.resolve.repair.web.repairrequest.controller.ReviewPropCondAction.doExecute(ReviewPropCondAction.java:102)
      at com.tavant.resolve.common.web.ResolveCommonAction.execute(ResolveCommonAction.java:158)
      at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
      at com.tavant.resolve.common.web.ResolveRequestProcessor.processActionPerform(ResolveRequestProcessor.java:54)
      at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
      at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1480)
      at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:524)
      at servletunit.struts.MockStrutsTestCase.actionPerform(MockStrutsTestCase.java:267)
      at com.tavant.resolve.repair.web.repairrequest.controller.test.TestReviewPropCondAction.testloadversiondata1(TestReviewPropCondAction.java:688)
      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:324)
      at junit.framework.TestCase.runTest(TestCase.java:154)
      at junit.framework.TestCase.runBare(TestCase.java:127)
      at junit.framework.TestResult$1.protect(TestResult.java:106)
      at junit.framework.TestResult.runProtected(TestResult.java:124)
      at junit.framework.TestResult.run(TestResult.java:109)
      at junit.framework.TestCase.run(TestCase.java:118)
      at junit.framework.TestSuite.runTest(TestSuite.java:208)
      at junit.framework.TestSuite.run(TestSuite.java:203)
      at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)