Need help with namespace error

I installed a package from the NuGet package installer and the compiler says it's in my references as the IntelliSense autocomplete "OpenQA.Selenium", but I keep getting a namespace error in unity but not in the compiler. Thanks for the help! ![alt text][1] ![alt text][2] [1]: /storage/temp/182024-1.png [2]: /storage/temp/182025-2.png