Configuring an ASP.NET application in IIS 6.0

Configuration Error 
Description: An error occurred during the processing of a configuration file
required to service this request. Please review the specific error details 
below and modify your configuration file appropriately. 

Parser Error Message: 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.

Source Error: 


Line 49:             ASP.NET to identify an incoming user. 
Line 50:         -->
Line 51:     <authentication mode="Windows"/>
Line 52: 
Line 53:     <customErrors mode="Off"/>


Source File: C:\<MYPATH>\web.config    Line: 51

Solution: 

Go into the properties of the virtual directory, click the 'Virtual Directory' tab and click 'Create' button under 'Application Settings', then set 'Execute permissions' to 'Scripts only'
Also check the ASP.NET tab to make sure it is set to the correct version for your app.
Lastly, make sure the application pool being used for the virtual directory is only used by other sites and virtual directories using the same version of ASP.NET.