org.osgi.framework.BundleException: The activator org.fordiac.ide.Activator for bundle org.fordiac.ide is invalid

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org.osgi.framework.BundleException: The activator org.fordiac.ide.Activator for bundle org.fordiac.ide is invalid
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:494)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2406)
at java.lang.Class.getConstructor0(Class.java:2716)
at java.lang.Class.newInstance0(Class.java:343)
at java.lang.Class.newInstance(Class.java:325)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:152)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:751)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:352)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:408)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:449)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:381)
at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:454)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:183)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:576)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:546)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:477)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass_LockClassLoader(ClasspathManager.java:465)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:445)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:381)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:457)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:231)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:150)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:751)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:352)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:408)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:449)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:381)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:457)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:231)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:874)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

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