annoying temporary files often while building project in Visual Studio 2012?

"hi, Many time, the following error occurs while running the asp.net project in Visual Studio 2012

[![> Error 24 The file name 'C:\Users\hr\AppData\Local\Temp\Temporary

ASP.NET Files\online invoice\7c64e6a9\cbf90bd2\qkrvpnfc.res' was already in the collection. Parameter name: fileName]1]1

Even though temporary files deleted, the above error occurring repeatedly.

Please help, thanks a lot"