I have removed the web.config files in sub folder but still getting this error when deployed on server

Server Error in '/search' 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 23:       </controls>
Line 24:     </pages>Line 25: <authentication mode="Forms"> Line 26:       <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
Line 27:     </authentication>

Source File: C:\Inetpub\oia_data_vd\sunday_final\final_wq\final_wq\web.config    Line: 25