org.eclipse.core.runtime.CoreException: Plug-in org.testng.eclipse was unable to load class org.testng.eclipse.launch.tester.TestNGPropertyTester.

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Plug-in org.testng.eclipse was unable to load class org.testng.eclipse.launch.tester.TestNGPropertyTester.
via Google Groups by ngsunw, 2 years ago
Plug-in org.testng.eclipse was unable to load class org.testng.eclipse.launch.TestNGLaunchShortcut.
java.lang.ClassNotFoundException: org.testng.eclipse.launch.tester.TestNGPropertyTester cannot be found by org.testng.eclipse_6.9.12.201607091356
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:439)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)

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