Application Updater block

[Amjath]

I put all my application updater block dll to GAC, to avoid keeping this
dll's in my bin folder.
After doing this all i build my project, it works fine, now i run my project
it give me an error like this,

"Unable to load configuration from the XML configuration file: 'My
Application Path'.
This can be caused by a number of problems, but the most common problem is
an incorrectly configured Updater configuration file.
The most probable sources of error are: missing nodes, incorrect attribute
names, white space within attributes or within elements, white space between
elements in the same sub-node, badly formed xml, or xml that does not conform
to the ConfigSchema.XS D."
Error @:
When my app tries to open my app.config file (in Init() of
UpdaterConfigur ation.vb - line is: _configuration =
CType(Configura tionSettings.Ge tConfig("appUpd ater"), UpdaterConfigur ation))

I get the following error:
ConfigurationSe ttings.GetConfi g("appUpdater") Run-time exception thrown:
System.Configur ation.Configura tionException -
Microsoft.Appli cationBlocks.Ap plicationUpdate r.UpdaterSectio nHandler,Micros o
ft.ApplicationB locks.Applicati onUpdater does not implement
IConfigSectionH andler.
But i place the dll inside my bin folder the same code works fine, whats the
problem,i am in very critical stage,its urgent
plz give me a solution.