When I have a page error, I get this message (bottom - or see page)
http://www.elevenx.com/exercise1.aspx

My web.config has the exact code as the error message. I get this
error even if I run on my server.

This is a virtual server, can that be the problem? I have working
some working .aspx pages.

How can I solve this issue so I can debug problem code?

ERROR MESAGE -------------------------------

Server Error in '/' Application.
------------------------------------------

Runtime Error
Description: An application error occurred on the server. The current
custom error settings for this application prevent the details of the
application error from being viewed remotely (for security reasons).
It could, however, be viewed by browsers running on the local server
machine.

Details: To enable the details of this specific error message to be
viewable on remote machines, please create a <customErrors> tag
within a "web.config" configuration file located in the root
directory of the current web application. This <customErrors> tag
should then have its "mode" attribute set to "Off".


<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>


Notes: The current error page you are seeing can be replaced by a
custom error page by modifying the "defaultRedirect" attribute of the
application's <customErrors> configuration tag to point to a custom
error page URL.


<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="RemoteOnly"
defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>