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我正在使用Eclipse Helios 3.6（32位）。我安裝了GWT插件並創建了一個新的Web應用程序。在客戶端文件夾，我試圖打開與GWT設計師文件，但不幸的是我得到了一個錯誤：與GWT設計器模式面臨問題
Internal Error encountered unexpected internal error. This could be caused by a bug or by a misconfiguration issue, conflict, partial update, etc.
java.lang.UnsupportedClassVersionError: Bad version number in .class file
堆棧跟蹤：
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at com.google.gdt.eclipse.designer.hosted.tdt.HostedModeSupport.loadImpl
(HostedModeSupport.java:110)
at com.google.gdt.eclipse.designer.hosted.tdt.HostedModeSupport.<init>
(HostedModeSupport.java:83)
at com.google.gdt.eclipse.designer.hosted.tdt.HostedModeSupportFactory.create
(HostedModeSupportFactory.java:32)
at com.google.gdt.eclipse.designer.model.widgets.support.GwtState.getHostedModeSupport
(GwtState... (missing part here)
...org.eclipse.wb.internal.core.editor.errors.ExceptionComposite$3.widgetSelected
(ExceptionComposite.java:129)
---等
我有工程屬性1.6中的JavaCompiler和preferences-> java->使用1.6安裝JDK/JRE。