on the IIS display error message

hi any one can help after deployed my web application to run the application this error message display what is the problem please

Thanks


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 14: <compilation strict="false" explicit="true" targetFramework="4.0" />
Line 15:
Line 16: <authentication mode="Forms">
Line 17: <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
Line 18: </authentication>


Source File: C:\inetpub\wwwroot\Test\zerfie_deploy\web.config Line: 16