HttpCompileException

Question

Hi,
We are getting an exception when browsing an .aspx page. Details of that exception are as follows
Exception information:

  Exception type: HttpCompileException
  Exception message: c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\df7bad55\b203ee9c\App_Web_index.aspx.fe46ec70.yqmselk3.0.cs(216): error CS0433: The type 'ASP.secondarynavmaster_master' exists in both 'c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\df7bad55\b203ee9c\App_Web_secondarynavmaster.master.cdcab7d2.kqfbvrll.dll' and 'c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\df7bad55\b203ee9c\App_Web_secondarynavmaster.master.cdcab7d2.gi81dgqn.dll'
 
Thread information:
  Thread ID: 177
  Thread account name: TDN\ptridionweb
  Is impersonating: False
  Stack trace:  at System.Web.Compilation.AssemblyBuilder.Compile()
  at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
  at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
  at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile)
  at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile)
  at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean noAssert)
  at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp, Boolean noAssert)
  at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath)
  at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
  at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Can someone help me to find out the root cause of this exception?

Thanks in Advance,
Soubhik