How can I remove these warning from my ASP.NET website

Hello, Im new to Asp.Net

Im getting two Warning in my Asp.net College Project. Plz help Me to remove these Warning

Warning 1:
Warning 1 The type 'sales' in 'c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_2jpj3krt.2.cs' conflicts with the imported type 'sales' in 'c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_sales.master.cdcab7d2.1qavwrx2.dll'. Using the type defined in 'c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_2jpj3krt.2.cs'. c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_2jpj3krt.2.cs 206

Warning 2:

Warning 2 The type 'login' in 'c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_2jpj3krt.6.cs' conflicts with the imported type 'login' in 'c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_login.master.cdcab7d2.cih9pnaz.dll'. Using the type defined in 'c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_2jpj3krt.6.cs'. c:\Users\Sunil\AppData\Local\Temp\Temporary ASP.NET Files\website4\e2eb66c2\90d6cf6d\App_Web_2jpj3krt.6.cs 206

What I have tried:

Nothing, I have no idea about these Warnings