Fresh install with error at compile time

Hi,

I'm using a fresh installation of Eclipse Juno with latest release of plugins (no update possible). I'm on Mac OS Moutain Lion with Java 7.

I wrote a little app using app engine 1.7.1 and GWT 2.5. Everything's correctly working on hosted mode, but when I try to compile to send it to Google :

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/gwt/dev/Compiler
Caused by: java.lang.ClassNotFoundException: com.google.gwt.dev.Compiler
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

I already checked the classpath : 

Do anyone know why I got this error ?

Thanks in advance

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