FindRibbons task failed unexpectedly when building addin for Outlook 2010

Question

We\'re building an Outlook 2010 plugin using VS2013, .NET4, Microsoft Async and BCL Portability (from Nuget) and encountering build errors similar to this question and this

Answer 1

I was able to fix this error by adding explicit assembly version references in my .csproj. See https://stackoverflow.com/a/29095545/4679952 for details.