getting started with ASPNET.portal question

[Richard]

Hi,

I am trying to learn asp.net through their own starterkit. But when I am
changing the pages I get an error message and that error message persists
even if I delete my changes.

The error message is
Compiler Error Message: BC30560 'Global' is ambiguous in the namespace
'ASPNET.StarterKit.Portal'.

My changes has been working before but this error is too confusing to me.
What am I doing wrong?

Richard