java.lang.NoClassDefFoundError: com/google/gwt/dev/DevMode; 2.1.0-M1

Hello.
I have a problem to start gwt-devmode since last week.
I use intellij IDEA 9.0.3.
I created a GWT Modul and a web facet.
I created a GWT Run Configuration too.

In use of gwt 2.0.3 all works fine, but when I try 2.1.0-M1 this
exception was thrown:

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/
gwt/dev/DevMode
Caused by: java.lang.ClassNotFoundException:
com.google.gwt.dev.DevMode
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

Last week it worked with gwt-2.1.0-M1.

can you help me please?

thanks in advance

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