This error can be caused by a virtual directory not being configured as an application in IIS
<p>It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level.  This error can be caused by a virtual directory not being configured as an application in IIS.  F:\LinqWebChat\LinqWebChat\LinqChat\web.config  50. plz hlp to recover from this bug    </p>
