[GWT] [ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core'

Hi all, 

I am upgrading to GWT 2.7.0 / Smartgwt 5, and I am seeing the following error when I try to build it through maven: 

[GWT]    [ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core' either directly or indirectly (most often by inheriting module 'com.google.gwt.user.User')

Here is my gwt.xml. Please let me know if you have any suggestions to fix this error. 

<?xml version="1.0" encoding="UTF-8"?>

<module rename-to='dregtool'>

<inherits name='com.google.gwt.user.User'/> 

<inherits name="com.google.gwt.core.Core" />

<inherits name="com.google.gwt.user.History"/> 

<inherits name="com.dreg.tools.ui.GWTFramework" />

<inherits name="com.dreg.at.atcommon.ATCommon" />

<inherits name="com.dreg.at.atcommon.smartgwt.Components" />

<inherits name="com.gwtext.GwtExt" />

<inherits name="com.dreg.ajax.smartgwt.dregSmartGwt" />

<inherits name="com.googlecode.gchart.GChart" />

<inherits name="com.dreg.i18n.dregI18n" />

  <source path='ui'/>

  <stylesheet src='css/dreg-tool.css'/>

  <entry-point class='com.dreg.at.ui.Main'/>

 

  <set-property name="gwt.suppressNonStaticFinalFieldWarnings" value="true" />

  <add-linker name="xsiframe"/>

</module>

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