GWT中遇到的问题

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GWT中遇到的问题20

我是一个GWT的初学者,在加载时报下面的错误：
[ERROR] Errors in 'file:/F:/javaweb/MultiSearch/src/com/multisearch/client/YahooSearcher.java'
[ERROR] Line 13: No source code is available for type com.multisearch.util.JSONRequestHandler; did you forget to inherit a required module?
[ERROR] Line 21: No source code is available for type com.multisearch.util.JSONRequest; did you forget to inherit a required module?
[ERROR] Unable to load module entry point class com.multisearch.client.MultiSearch (see associated exception for details)
java.lang.ClassNotFoundException: com$multisearch$client$MultiSearch
at com.google.gwt.dev.shell.CompilingClassLoader.findClass(CompilingClassLoader.java:626)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at com.google.gwt.dev.shell.ModuleSpace.loadClassFromSourceName(ModuleSpace.java:523)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:305)
at com.google.gwt.dev.shell.BrowserWidget.attachModuleSpace(BrowserWidget.java:343)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6.access$300(BrowserWidgetIE6.java:37)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.gwtOnLoad(BrowserWidgetIE6.java:77)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.invoke(BrowserWidgetIE6.java:161)
at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
at com.google.gwt.dev.SwtHostedModeBase.processEvents(SwtHostedModeBase.java:235)
at com.google.gwt.dev.HostedModeBase.pumpEventLoop(HostedModeBase.java:558)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

JSONRequest类和JSONRequestHandler如下；

package com.multisearch.util;

public class JSONRequest
{
public static void get( String url, JSONRequestHandler handler )
{
String callbackName = "JSONCallback"+handler.hashCode();
get( url+callbackName, callbackName, handler );
}
public static void get( String url, String callbackName, JSONRequestHandler handler )
{
createCallbackFunction( handler, callbackName );
addScript(url);
}
public static native void addScript(String url) /*-{
var scr = document.createElement("script");
scr.setAttribute("language", "JavaScript");
scr.setAttribute("src", url);
document.getElementsByTagName("body")[0].appendChild(scr);
}-*/;

private native static void createCallbackFunction( JSONRequestHandler obj, String callbackName )/*-{
tmpcallback = function( j ){
obj.@com.multisearch.util.JSONRequestHandler::onRequestComplete(Lcom/google/gwt/core/client/JavaScriptObject;)( j );
};
eval( "window."+callbackName+"=tmpcallback" );
}-*/;
}

package com.multisearch.util;

import com.google.gwt.core.client.JavaScriptObject;

public interface JSONRequestHandler
{
// public void onRequestComplete( String json );
public void onRequestComplete( JavaScriptObject json );
}

是模块配置问题吗？那应该怎么配置啊，这个东西不怎么理解，高手们可以详细说明一下这个模块...期待中!!
问题补充：
如何配置啊，能否详细说明一下吗？
问题补充：
按以上回答的，我加了的，但还是错误，配置文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.6.4//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.6.4/distro-source/core/src/gwt-module.dtd">
<module rename-to='multisearch'>

<inherits name='com.google.gwt.user.User'/>
<inherits name="com.google.gwt.json.JSON"/>
<inherits name='com.multisearch.GwtApps'/>
<inherits name='com.google.gwt.user.theme.standard.Standard'/>

<entry-point class='com.multisearch.client.MultiSearch'/>
</module>

是哪错了啊?

GWT