Solved ASP.NET Error - Please Help

When I try acessing a website at http://www.johnscompany.net/admentor, I get the following error:
Server Error in '/' Application.
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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 36: "Passport" and "None"
Line 37: -->
Line 38: <authentication mode="None" />
Line 39:
Line 40: <!-- APPLICATION-LEVEL TRACE LOGGING



Source File: \\premfs7\sites\premium2\hexstar\webroot\admentor\web.config Line: 38




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Version Information: Microsoft .NET Framework Version:1.0.3705.288; ASP.NET Version:1.0.3705.360

How can this error be resolved?