How to run rainbow

Today, I downloaded a rainbow, and the database has been installed successfully. However, an error occurs when you access the default. aspx page.
Server Error in '/rainbow' application.

Error executing child request for processing topdefault. 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 processing topdefault. aspx.

Source error:

Line 29: else line 30: {Line 31: Server. transfer ("Publish topdefault. aspx "); line 32: // response. redirect ("Publish topdefault. aspx "); line 33 :}

Source file:C: \ workspace \ tools \ rainbow \ rainbow-rc3 \ default. aspx. CSLine:31

I have not modified anything. I don't know how to help?