java.lang.NoClassDefFoundError: org/apache/log4j/Logger

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java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at com.salesforce.ide.core.ForceIdeCorePlugin.(ForceIdeCorePlugin.java:30)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:136)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:970)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340)
at org.eclipse.osgi.framework.internal.core.SingleSourcePackage.loadClass(SingleSourcePackage.java:37)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:405)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:136)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:970)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340)
at org.eclipse.osgi.framework.internal.core.SingleSourcePackage.loadClass(SingleSourcePackage.java:37)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:405)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.salesforce.ide.ui.editors.intro.browser.IntroStartup.earlyStartup(IntroStartup.java:44)
at org.eclipse.ui.internal.EarlyStartupRunnable.runEarlyStartup(EarlyStartupRunnable.java:87)
at org.eclipse.ui.internal.EarlyStartupRunnable.run(EarlyStartupRunnable.java:66)

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