Could not find schema information

[Guest]

I am creating an intranet using Visual Web Developer Express Edition.
Everything has been working OK until yesterday when I started getting 62
messages all beginning "Could not find schema information for the".

I am using Cassini as the web server on my PCand I can still run my site
from within VWD. Does anyone know what I have done to cause these messages to
appear?

Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:configuration'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:appSettings'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:connectionStrings'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'name'.
Could not find schema information for the attribute 'connectionString'.
Could not find schema information for the attribute 'providerName'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:system.web'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:roleManager'.
Could not find schema information for the attribute 'enabled'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:compilation'.
Could not find schema information for the attribute 'debug'.
Could not find schema information for the attribute 'strict'.
Could not find schema information for the attribute 'explicit'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:assemblies'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'assembly'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:pages'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:namespaces'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:clear'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'namespace'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:anonymousIdentification'.
Could not find schema information for the attribute 'enabled'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:profile'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:properties'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'name'.
Could not find schema information for the attribute 'type'.
Could not find schema information for the attribute 'allowAnonymous'.
Could not find schema information for the element
'http://schemas.microsoft.com/.NetConfiguration/v2.0:add'.
Could not find schema information for the attribute 'name'.
Could not find schema information for the attribute 'type'.
Could not find schema information for the attribute 'allowAnonymous'.