Could not find a part of the path: bin\roslyn\csc.exe
Not really sure why this happens, usually every time you check out a clean copy of the code to a new directory, but the fix is easy:
Open the NuGet Package Manager Console (Tools | NuGet Package Manager | Package Manager Console) and run the following command:
Update-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform -r
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