Hi, thanks for posting!
Unfortunately the version of NCrunch you are using was released in August 2015, so it is already more than a year out of date. There have been numerous fixes since v2.16. It's quite likely the problem you're experiencing has already been resolved. I recommend upgrading to the latest version to see if this solves your problem.
At the moment, NCrunch also doesn't actually support VS15... unless you meant Visual Studio 2015 :)