After I imported the "HoloToolkit-Unity-Examples-2017.2.1.1.unitypackage" in my project, I got 20 errors and after I fixed them by removing the code lines I got 900 warnings. That happens although my SDK is on right version10.0.16299.0.
no errors, no warning
~20 errors and after fixing 874 warnings
create a unity project, apply build settings for HoloLens (like in https://docs.microsoft.com/en-us/windows/mixed-reality/unity-development-overview), import MRK by Assets->Import Package->Custom Package
Version 2018.1.4f1 (1a308f4ebef1)
2017.2.1.1
Did you also import the main package? The Examples package is typically an add-on package and doesn't contain the Toolkit itself.
What were the errors?
I totally read +9000

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I totally read +9000