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What should I do if I encounter “java.lang.NoClassDefFoundError: com/instantiations/eclipse/debug/Tracer” error when trying to run my test?

April 26, 2017debug Eclipse encounter Error instantiations java.lang.noclassdeffounderror run Test tracer

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What should I do if I encounter “java.lang.NoClassDefFoundError: com/instantiations/eclipse/debug/Tracer” error when trying to run my test?

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java.lang.NoClassDefFoundError: com/instantiations/eclipse/debug/Tracer at com.windowtester.swt.monitor.UIThreadMonitor.trace(UIThreadMonitor.java:444) at com.windowtester.swt.monitor.UIThreadMonitor.setListener(UIThreadMonitor.java:153) at junit.extensions.UITestCase.startTestMonitor(UITestCase.java:686) at junit.extensions.UITestCase.runBare(UITestCase.java:493) 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:128) 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