Problem with complie ASP.Net 2005

[jesusdaa1]

Hello Friends:
I have a problem with my project web. net 2005, when I compile my program shows me three errors what don´t undestanding:

Error 1 'ASP.try_content_page_aspx.GetTypeHashCode()': no suitable method
found to override.

Error 2 'ASP.try_content_page_aspx.ProcessRequest(System.W eb.HttpContext)':
no suitable method found to override

Error 3 'ASP.try_content_page_aspx' does not implement interface member
'System.Web.IHttpHandler.IsReusable'

Could guide that this is happening and that I do
thanks best regards.