GWT compiler error with ListType

Hi all,

I have the following error from GWT compiler, event if the User
module is included:

__________________________

Compiling module com.soladhoc.friends.Friends
Validating newly compiled units
[ERROR] Errors in 'file:/C:/Users/Pierre/workspace-GAE/Friends/
src/com/soladhoc/friends/shared/proxy/NamedListProxy.java'
[ERROR] Line 17: No source code is available for type
com.google.gwt.i18n.server.Type.ListType; did you forget to inherit a
required module?
________________________________

The question is : Why that error if I18N is included in User module ?

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