关于rainbow的运行的问题

  今天下载了个rainbow，数据库已经安装成功。但访问default.aspx页时 老是出错。
 

Server Error in '/Rainbow' Application.

---

Error executing child request for DesktopDefault.aspx.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Error executing child request for DesktopDefault.aspx.

Source Error:

Line 29:             else 
Line 30:             {
Line 31: 				Server.Transfer("DesktopDefault.aspx");
Line 32: 				//Response.Redirect("DesktopDefault.aspx");
Line 33:             }

Source File: c:\workspace\工具\rainbow\rainbow-rc3\default.aspx.cs    Line: 31


我什么都没有修改，，，不知道那位能帮帮忙？