SuperDev mode runs fine ,but compiled version tells 404....undefined.cache.js

Hello,

      I have ubuntu 16.04 64 bit(with german UI language) + chrome 54.0.2840.71 (English is default language), and doubt this is a language problem,and my *.gwt.xml has these lines:

         <!-- I18N related stuffs -->
         <inherits name="com.google.gwt.i18n.I18N" />
         <extend-property name="locale" values="en" />
         <extend-property name="locale" values="zh_CN" />
         <set-property name="locale" value="en,zh_CN" />
         <set-property-fallback name="locale" value="en" />

         <set-property name="user.agent" value="safari" />

    Only Chinese and English constants are provided,so what is the problem?

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