Add "using System.Numerics" in Grasshopper C# Script

I’m trying to import the Accord.Statistics.Distributions.Univariate namespace but I get an error doing so.
I checked for typos, nothing there.

error: Could not load file or assembly ‘Accord, Version=3.8.2.0, Culture=neutral, PublicKeyToken=fa1a88e29555ccf7’ or one of its dependencies. The system cannot find the file specified. (line: 72)

I did add the assembly Accord.Statistics.dll to the component, so I don’t see why it is not recognizing it.
The Accord.Statistics namespace however does work.

Any suggestions?