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After I install the AJDT 2.2.3 on Rational Software Archtect, every Editor displays the error: Plug-in org.eclipse.jdt.ui was unable to load class org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor I am using the Rational Software Architect 9 with Eclipse 4.2.2. Used the link ( http://download.eclipse.org/tools/ajdt/42/update ) to install the AJDT. Searching on the web I found this: http://www.eclipse.org/forums/index.php/t/74968/ ), but removing the Data Tools did not work for me. I also updated the Data Tools to 1.10.2, and yet not working. Can anybody help me? Adding more info: I was searching for the installed JRE in preferences, but when I click Preferences -> Java I got an error: "An error has occurred when creating this preference page." And when I try the "Installed JRE's I got a popup: "Unable to create the selected preference page. An error occurred while automatically activating bundle org.eclipse.jdt.debug.ui(1537)" Another thing I am not sure if it is clear. The Editors I was mentioning were the Java File Editor, The Package Explorer, the Java View. I tryed to open an .xml file and it seems to work fine. Here is a picture of the Eclipse error tab: dl.dropboxusercontent.com/u/71227599/ajdt.PNG Here is the details stack : org.eclipse.core.runtime.CoreException: Plug-in org.eclipse.jdt.ui was unable to load class org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart. at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:176) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905) at org.eclipse.core.internal.registry.ConfigurationElement.createExe

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