怎么改都不行，什么原因，求解：
下载“http://localhost:3044/DBService.svc”时出错。
请求失败，错误信息为:
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<span><H1>“/”应用程序中的服务器错误。<hr width=100% size=1 color=silver></H1>
<h2> <i>配置错误</i> </h2></span>
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<b> 说明: </b>在处理向该请求提供服务所需的配置文件时出错。请检查下面的特定错误详细信息并适当地修改配置文件。
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<b> 分析器错误消息: </b>没有名称为“SilverlightDB.Web.DBServiceBehavior”的服务行为。<br><br>
<b>源错误:</b> <br><br>
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行 31: <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
行 32: <services>
<font color=red>行 33: <service behaviorConfiguration="SilverlightDB.Web.DBServiceBehavior" name="SilverlightDB.Web.DBService" >
</font>行 34: <endpoint address="" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_DBService" contract="SilverlightDB.Web.DBService"/>