How to avoid this error

Question

Server Error in '/' Application.

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Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0433: The type 'Rpt_CotractorWorkforce' exists in both 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\1d9d2bcf\1b5ea224\assembly\dl3\fe0c522c\5513cdb1_540ad101\App_Web_iri0dvfd.DLL' and 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\1d9d2bcf\1b5ea224\assembly\dl3\79b65480\410c25ae_540ad101\App_Code.DLL'

Source Error:

Line 152:     Line 153:    [System.Runtime.CompilerServices.CompilerGlobalScopeAttribute()] Line 154:    public class rpt_cotractorworkforce_aspx : global::Rpt_CotractorWorkforce, System.Web.SessionState.IRequiresSessionState, System.Web.IHttpHandler { Line 155:         Line 156:        private static bool @__initialized;

Source File: c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\1d9d2bcf\1b5ea224\App_Web_rpt-cotractorworkforce.aspx.cdcab7d2.jy5pjvbr.0.cs Line: 154

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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408