Visual Studio C# web application build fails with "Error 46"

After rebuild I've got following error:

"Error 46 It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. ..."

Clear build and rebuild didn't help. Deleting all files in Bin folder did help! :)

When you are sick of deleting bin folder, just simple add folowing tag to *.csproj:

<Target Name="AfterBuild" Condition="'$(Configuration)'=='Release'">
  <RemoveDir Directories="$(IntermediateOutputPath)" />
</Target>

Source:
http://stackoverflow.com/questions/7388359/mvc3-project-build-fails-because-of-web-config-in-obj-folder

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