java.lang.NoClassDefFoundError: com/google/gwt/dev/Compiler

Hi all,

When i upgrated my eclipse's google plug-in,when i click the compile
button,it says
java.lang.NoClassDefFoundError: com/google/gwt/dev/Compiler
Exception in thread "main"
but i can run this project in eclipse, anybody knows the reason?

My eclipse version :3.5(Java) not J2EE ,
GWT-SDK:2.0.3
GAE:1.3.8

Jun Kou
Thanks.

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