خطا در اجراي سايت؟(خطای وب کانفیگ)

[سعدی]

سلام
بعد از اينكه آدرس سايت را مي زنم خطايي كه در زير نوشتم را به من نمايش مي دهد لطفا منو راهنمايي كنيد.تشكر

Server Error in '/' Application.
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 165: <allow users="*" />
Line 166: </authorization>
Line 167: <trust level="Full" />
Line 168: </system.web>
Line 169: </location>

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