I replaced my WinXP machine with Windows 7 machine and re-installed all 
software. I am running VS 2008 with Ajax Control Toolkit.  When I go into a 
page that has ajax controls I am getting the top @ Page line underlined with 
the error "ASP.NET runtime error: An error occurred loading a configuration 
file: Failed to start monitoring changes to '.....

When I go into the design mode I get "Error Creating Control.  Unknown 
server tag 'cc1:CalendarExtender'

The web site runs fine and I get none of this in my other PC which is WinXP 
and VS 2008.  Any ideas on how to fix this?  Thanks.

David 

msnews.microsoft.com wrote:
> I replaced my WinXP machine with Windows 7 machine and re-installed
> all software. I am running VS 2008 with Ajax Control Toolkit.  When I
> go into a page that has ajax controls I am getting the top @ Page
> line underlined with the error "ASP.NET runtime error: An error
> occurred loading a configuration file: Failed to start monitoring
> changes to '.....
> When I go into the design mode I get "Error Creating Control.  Unknown
> server tag 'cc1:CalendarExtender'
>
> The web site runs fine and I get none of this in my other PC which is
> WinXP and VS 2008.  Any ideas on how to fix this?  Thanks.

Have you installed SP1 for VS2008, and are you running it as Administrator 
(as in: right-click VS and choose Run as Administrator)?

Andrew 

"Andrew Morton" <akm@in-press.co.uk.invalid> wrote in message 
news:7oplglF13notoU1@mid.individual.net...
> msnews.microsoft.com wrote:
>> I replaced my WinXP machine with Windows 7 machine and re-installed
>> all software. I am running VS 2008 with Ajax Control Toolkit.  When I
>> go into a page that has ajax controls I am getting the top @ Page
>> line underlined with the error "ASP.NET runtime error: An error
>> occurred loading a configuration file: Failed to start monitoring
>> changes to '.....
>> When I go into the design mode I get "Error Creating Control.  Unknown
>> server tag 'cc1:CalendarExtender'
>>
>> The web site runs fine and I get none of this in my other PC which is
>> WinXP and VS 2008.  Any ideas on how to fix this?  Thanks.
>
> Have you installed SP1 for VS2008, and are you running it as Administrator 
> (as in: right-click VS and choose Run as Administrator)?
>
> Andrew
>
Yes and yes.

David 

"Andrew Morton" <akm@in-press.co.uk.invalid> wrote in message 
news:7oplglF13notoU1@mid.individual.net...
> msnews.microsoft.com wrote:
>> I replaced my WinXP machine with Windows 7 machine and re-installed
>> all software. I am running VS 2008 with Ajax Control Toolkit.  When I
>> go into a page that has ajax controls I am getting the top @ Page
>> line underlined with the error "ASP.NET runtime error: An error
>> occurred loading a configuration file: Failed to start monitoring
>> changes to '.....
>> When I go into the design mode I get "Error Creating Control.  Unknown
>> server tag 'cc1:CalendarExtender'
>>
>> The web site runs fine and I get none of this in my other PC which is
>> WinXP and VS 2008.  Any ideas on how to fix this?  Thanks.
>
> Have you installed SP1 for VS2008, and are you running it as Administrator 
> (as in: right-click VS and choose Run as Administrator)?
>
> Andrew
>
Andrew,
The "Run as Administrator" worked, which is strange because I am a member of 
administrators on both the local PC and the network domain.

David 

DavidC wrote:
> Andrew,
> The "Run as Administrator" worked, which is strange because I am a
> member of administrators on both the local PC and the network domain.

I'm surprised VS didn't tell you that was required (/the/ Administrator 
account is not the same as /an/ administrator account); mine does (on W7 
64-bit).

It gets annoying when you start up VS and then think "oops... should have 
Run as Administrator". ISTR they've fixed it for VS2010.

Anyway, glad that solution worked for you.

Andrew