Quick Fix:

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 50:             ASP.NET to identify an incoming user. 
Line 51:         -->
Line 52:         
Line 53: