Estou farto desse erro. Eu pesquisei por toda a web e tentei todas as sugestões possíveis para esse erro que encontrei.

excluir app_code, criar, adicionar arquivos de volta, publicar. (não funcionou)excluir arquivos asp.net temporários (não funcionou)

No final, tentei até a linha de comando e obtive o seguinte rastreamento de pilha.

error ASPRUNTIME: Object reference not set to an instance of an object.

[NullReferenceException]: Object reference not set to an instance of an object.
   at System.Web.Compilation.BuildManager.CopyPrecompiledFile(VirtualFile vfile,
 String destPhysicalPath)
   at System.Web.Compilation.BuildManager.CopyStaticFilesRecursive(VirtualDirect
ory sourceVdir, String destPhysicalDir, Boolean topLevel)
   at System.Web.Compilation.BuildManager.CopyStaticFilesRecursive(VirtualDirect
ory sourceVdir, String destPhysicalDir, Boolean topLevel)
   at System.Web.Compilation.BuildManager.CopyStaticFilesRecursive(VirtualDirect
ory sourceVdir, String destPhysicalDir, Boolean topLevel)
   at System.Web.Compilation.BuildManager.PrecompileAppInternal(VirtualPath star
tingVirtualDir)
   at System.Web.Compilation.BuildManager.PrecompileApp(VirtualPath startingVirt
ualDir)
   at System.Web.Compilation.BuildManager.PrecompileApp(ClientBuildManagerCallba
ck callback)
   at System.Web.Compilation.BuildManagerHost.PrecompileApp(ClientBuildManagerCa
llback callback)
   at System.Web.Compilation.BuildManagerHost.PrecompileApp(ClientBuildManagerCa
llback callback)
   at System.Web.Compilation.ClientBuildManager.PrecompileApplication(ClientBuil
dManagerCallback callback, Boolean forceCleanBuild)
   at System.Web.Compilation.ClientBuildManager.PrecompileApplication(ClientBuil
dManagerCallback callback)
   at System.Web.Compilation.Precompiler.Main(String[] args)

Eu usei a seguinte linha de comando:

aspnet_compiler.exe -p d:\code\websites\brokerweb -v / d:\code\websites\published -f -c -errorstack -u