One of the new features of VS2015, Live Code Analysers, prevents ncrunch from being able to build a project.
Simple test case:
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File > New > Class Library (I used .NET Framework 4.6)
Enable ncrunch (build succeeds)
Install-Package Microsoft.AnalyzerPowerPack
Build now fails. I presume this is because the ncrunch build engine doesn't understand analysers.
NCrunch: This project was built on server '(local)'
CSC (0, 0): Metadata file '..\packages\Microsoft.AnalyzerPowerPack.1.0.0\analyzers\dotnet\cs\Microsoft.AnalyzerPowerPack.Common.dll' could not be found
Try adding the AnalyzerPowerPack package directory to the 'Additional files to include' NCrunch project-level or solution-level configuration setting. This will allow NCrunch to include the files in the workspace and your build should operate as normal.
I can confirm that adding the files in this way does allow the build to function.
However, as this is one of the new features added in VS2015, I think it'll be something people come up against fairly regularly, so it would be good to have as an enhancement in a future version.