Tobii EyeX SDK Error

Please teach me how to workaround below error.
[error]
File Temp/StagingArea/Data/Managed/Tobii.EyeX.Client.Net20.dll added twice UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

I use the environment below.
・Unity 5.4.3f1
・Windows10 64bit
・Visual studio2013
・EyeTracker4C

thank you.

Hi!

You can find the answer here: