Unity asset help

hi friends can some one help with this little error when i put the asset i downloaded from the forum given buy the pimax team in unity the image of error and the asset is linked below

Asset given to me by team :point_down:
you can download it here now! MEGA key: !Ma9riQ1cL1CSY-IXkIq95Jhc7B87dDlGKRQjYzyKs8c This is a beta version, and you need to install Piplay first, and then you can open it.

Image of error :point_down:

please help

I rather use unity(5) itself with VRmode activated (in the player setting) with OpenVR selected (the default one is oculus). It’s actually fine with pimax.