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java.lang.IllegalArgumentException: path is empty	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:319)	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:278)	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:406)	at org.eclipse.emf.edapt.cdo.tests.CDOMigrationTestBase.clearCDORepositories(CDOMigrationTestBase.java:84)	at org.eclipse.emf.edapt.cdo.tests.CDOMigrationTestBase.setUp(CDOMigrationTestBase.java:75)	at junit.framework.TestCase.runBare(TestCase.java:139)	at junit.framework.TestResult$1.protect(TestResult.java:122)	at junit.framework.TestResult.runProtected(TestResult.java:142)	at junit.framework.TestResult.run(TestResult.java:125)	at junit.framework.TestCase.run(TestCase.java:129)	at junit.framework.TestSuite.runTest(TestSuite.java:255)	at junit.framework.TestSuite.run(TestSuite.java:250)	at org.eclipse.emf.edapt.cdo.tests.CDOMigrationTestSuite.run(CDOMigrationTestSuite.java:80)	at junit.framework.TestSuite.runTest(TestSuite.java:255)	at junit.framework.TestSuite.run(TestSuite.java:250)	at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84)	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)