Erreur lors de la Compilation d'une Application Smart GWT

Bonjour, je suis débutant dans la technologie GWT, j'ai eu un problème répété autant de fois ( [ERROR] Line 38: No source code is available for type com.smartgwt.client.widgets.form.fields.TextItem;did you forget to inherit a required module? ...) mais j'ai pas su résoudre l'erreur générée pour mon cas.

Voici le message d'erreur en faite :

Code:

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Compiling module com.hraccess.wt.cl.WTWebClient
   Validating newly compiled units
      Ignored 6 units with compilation errors in first pass.
Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.
   Finding entry point classes
      [ERROR] Errors in 'file:/C:/myWorkspace/WTWebClient/src/main/java/com/hraccess/wt/cl/client/WTWebClient.java'
         [ERROR] Line 38: No source code is available for type com.smartgwt.client.widgets.form.fields.TextItem; did you forget to inherit a required module?
         [ERROR] Line 49: No source code is available for type com.smartgwt.client.widgets.form.fields.FormItem; did you forget to inherit a required module?
         [ERROR] Line 86: No source code is available for type com.smartgwt.client.widgets.Label; did you forget to inherit a required module?
         [ERROR] Line 100: No source code is available for type com.smartgwt.client.widgets.form.fields.SelectItem; did you forget to inherit a required module?
         [ERROR] Line 105: No source code is available for type com.smartgwt.client.widgets.form.fields.events.ChangedHandler; did you forget to inherit a required module?
         [ERROR] Line 108: No source code is available for type com.smartgwt.client.widgets.form.fields.events.ChangedEvent; did you forget to inherit a required module?
         [ERROR] Line 137: No source code is available for type com.smartgwt.client.widgets.layout.HLayout; did you forget to inherit a required module?
         [ERROR] Line 138: No source code is available for type com.smartgwt.client.data.DataSource; did you forget to inherit a required module?
         [ERROR] Line 139: No source code is available for type com.smartgwt.client.widgets.form.DynamicForm; did you forget to inherit a required module?
         [ERROR] Line 140: No source code is available for type com.smartgwt.client.widgets.grid.ListGrid; did you forget to inherit a required module?
         [ERROR] Line 142: No source code is available for type com.smartgwt.client.widgets.IButton; did you forget to inherit a required module?
         [ERROR] Line 155: No source code is available for type com.smartgwt.client.types.Alignment; did you forget to inherit a required module?
         [ERROR] Line 156: No source code is available for type com.smartgwt.client.widgets.events.ClickHandler; did you forget to inherit a required module?
         [ERROR] Line 157: No source code is available for type com.smartgwt.client.widgets.events.ClickEvent; did you forget to inherit a required module?
         [ERROR] Line 168: No source code is available for type com.smartgwt.client.widgets.layout.VLayout; did you forget to inherit a required module?
         [ERROR] Line 178: No source code is available for type com.smartgwt.client.widgets.grid.events.RecordClickHandler; did you forget to inherit a required module?
         [ERROR] Line 179: No source code is available for type com.smartgwt.client.widgets.grid.events.RecordClickEvent; did you forget to inherit a required module?
      [ERROR] Unable to find type 'com.hraccess.wt.cl.client.WTWebClient'
         [ERROR] Hint: Previous compiler errors may have made this type unavailable
         [ERROR] Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly
Exception in thread "UnitWriteThread" java.lang.NullPointerException
	at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:182)
	at com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:91)
	at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
	at com.google.gwt.dev.javac.PersistentUnitCache$UnitWriter.run(PersistentUnitCache.java:226)

voici le code du fichier de WtWebClient.gwt.xml

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<module rename-to='wtwebclient'>
  <!-- Inherit the core Web Toolkit stuff.                        -->
  <inherits name='com.google.gwt.user.User'/>
 
  <inherits name='com.google.gwt.user.theme.clean.Clean'/>
 
  <!-- Specify the app entry point class.                         -->
  <entry-point class='com.wt.cl.client.WTWebClient'/>
 
  <!-- Specify the paths for translatable code                    -->
  <source path='client'/>
  <source path='client/data'/>
  <source path='shared'/>  
</module>

la classe WTWebClient est dans le package com.wt.cl.client et fait des appels au classes sous ce package com.wt.cl.client.data.

Je suis bloqué, Merci par avance.:?