为什么发帖也会出错

发帖内容“已知点A(Xo,Yo) B(X1,Y1) C(X2,Y2)求点A距直线BC的距离L及AB与AC夹角”“/”应用程序中的服务器错误。
--------------------------------------------------------------------------------远程处理配置失败，异常为“System.Runtime.Remoting.RemotingException: 信道“channel01”已注册。
  在 System.Runtime.Remoting.Channels.ChannelServices.RegisterChannelInternal(IChannel chnl, Boolean ensureSecurity)
  在 System.Runtime.Remoting.Channels.ChannelServices.RegisterChannel(IChannel chnl, Boolean ensureSecurity)
  在 System.Runtime.Remoting.RemotingConfigHandler.ConfigureChannels(RemotingXmlConfigFileData configData, Boolean ensureSecurity)
  在 System.Runtime.Remoting.RemotingConfigHandler.ConfigureRemoting(RemotingXmlConfigFileData configData, Boolean ensureSecurity)”。 
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.Runtime.Remoting.RemotingException: 远程处理配置失败，异常为“System.Runtime.Remoting.RemotingException: 信道“channel01”已注册。
  在 System.Runtime.Remoting.Channels.ChannelServices.RegisterChannelInternal(IChannel chnl, Boolean ensureSecurity)
  在 System.Runtime.Remoting.Channels.ChannelServices.RegisterChannel(IChannel chnl, Boolean ensureSecurity)
  在 System.Runtime.Remoting.RemotingConfigHandler.ConfigureChannels(RemotingXmlConfigFileData configData, Boolean ensureSecurity)
  在 System.Runtime.Remoting.RemotingConfigHandler.ConfigureRemoting(RemotingXmlConfigFileData configData, Boolean ensureSecurity)”。源错误: 执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。  堆栈跟踪: 
[RemotingException: 远程处理配置失败，异常为“System.Runtime.Remoting.RemotingException: 信道“channel01”已注册。
   在 System.Runtime.Remoting.Channels.ChannelServices.RegisterChannelInternal(IChannel chnl, Boolean ensureSecurity)
   在 System.Runtime.Remoting.Channels.ChannelServices.RegisterChannel(IChannel chnl, Boolean ensureSecurity)
   在 System.Runtime.Remoting.RemotingConfigHandler.ConfigureChannels(RemotingXmlConfigFileData configData, Boolean ensureSecurity)
   在 System.Runtime.Remoting.RemotingConfigHandler.ConfigureRemoting(RemotingXmlConfigFileData configData, Boolean ensureSecurity)”。]
   System.Runtime.Remoting.RemotingConfigHandler.ConfigureRemoting(RemotingXmlConfigFileData configData, Boolean ensureSecurity) +439
   System.Runtime.Remoting.RemotingConfigHandler.DoConfiguration(String filename, Boolean ensureSecurity) +39
   System.Runtime.Remoting.RemotingConfiguration.Configure(String filename, Boolean ensureSecurity) +42
   CSDN.Community.TopicFileDataCenter.TopicFileDataCenterEntry.GetT5TFC() +165
   CSDN.Community.TopicFileDataCenter.TopicFileDataCenterEntry.get_t5Tfc() +25
   CSDN.Community.TopicFileDataCenter.TopicFileDataCenterEntry.T5PostTopic(ConfigInfo smallForum, ConfigInfo bigForum, TopicInfo topic, CommunityUser topicAuther, UserSectionProfile bigForumProfile) +15
   CSDN.Community.PointForum.Services.PostTopicManager.PostTopic(CommunityUser user, TopicInfo topic, String& errorInfo) +1492
   CSDN.Community.WebSite.PointForum.Forum.PostTopic.bt_Submit_Click(Object sender, EventArgs e) +829
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565 
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版本信息: Microsoft .NET Framework 版本:2.0.50727.3603; ASP.NET 版本:2.0.50727.3614