Windows - Why do I get the error “The type or namespace name ‘WinRTContainer’ could not be found"?

If you are getting the following when compiling the BarcodeScannerWin8:

The type or namespace name 'WinRTContainer' could not be found (are you missing a using directive or an assembly reference?)

Uninstall and install the Caliburn.Micro NuGet package from the solution. This will resolve the missing assembly reference error. Right-click on the solution, select "Manage NuGet Packages..." and open the Installed tab to remove Caliburn.Micro from the list of installed packages. Then reinstall the package by downloading it again from the NuGet package repository.