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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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)	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)	at java.lang.ClassLoader.loadClass(Unknown Source)