My comment to try this suggestion moved to an answer on request of the OP.
" I'm guessing that you have a versioning mismatch. Sorry I cn't help but you might want to update all of your nugets and hopefully match them up."
Or
" maybe helpful stackoverflow.com/a/7777319/3225 "
You should be able to force an exact version with brackets:
Full info on the formats you can use are on the NuGet site, here:
http://docs.nuget.org/docs/reference/version-range-specification
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