c# - ASP.NET Build Error : The type exists in both dlls -

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while building project, got below error message.

the type 'tracker_ascx' exists in both 'appdata\local\temp\190\temporary asp.net files\root\web_tracker.ascx.7a9a6bd4.fnv2mhdj.dll' , 'appdata\local\temp\190\temporary asp.net files\root\web_tracker.ascx.7a9a6bd4.pxdl7dxj.dll'.

the application runs in .net framework 4.0

this happend because may have reference of old dlls if u added new version. clean solution , rebuild it.


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