config files must contain trust section

[Bob]

Hi,
Built a webservice which was working until I fiddled with the Config files.
I thought I had put every back to its original state but I guess not.
When I try to build the Web site I get the following error:
"The application's configuration files must contain 'trust' section. "
Also when looking at the app.config file line:
<section name="EasyAdminClient.Properties.Settings"
type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"
/>

I get an error of "the requirePermission attribute is not declared" when I
mouse over requirePermission

Is there any way to get back to default conditions?

Thanks

Bob