Error Occurred while configure DNN website configured on IIS. Some One Please Help Me . How to resolve this

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 123:       <!--<machineKey validationKey="B55EB604E3FA0274B89CD98D3DB0D0E96A6C9753" decryptionKey="87F1E200EAAA2B264312E4A9776DD57CFC388B2E6DEB23D5" decryption="3DES" validation="3DES" />-->
Line 124:
Line 125:    <machineKey decryption="DES" decryptionKey="25579EFCB03D11D045A62B58567A540DAFB8132F305C8EF0" validation="3DES" validationKey="FD428388B8E7C12B83BD3543BA13F8B4C5C0C36083C54523963B08B0798524CDC9AD6444D0A9AE6E22B714A2E95A5FFED3601FDC4E5DB02B84A5644F4786B90E" />
Line 126:
Line 127:    <!-- HttpModules for Common Functionality -->

Source File: C:\inetpub\wwwroot\dnnpro5.4.3\web.config    Line: 125


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Version Information: Microsoft .NET Framework Version:2.0.50727.6407; ASP.NET Version:2.0.50727.6387