There is a dependency that you need to put in “by hand” that you missed.
However, our interaction eye tracking libraries are from today available on nuget, so I would recommend to install the packages through nuget package manager in Visual Studio instead. Then all the dependencies would be handled automatically when building the solution.
Package is at https://www.nuget.org/packages/Tobii.EyeX.Framework/ and would be found in nuget package manager if you search for tobii eye tracking.
Let me know if it does not work out, then I’ll look into it.