Problem with GoogleVR upload in Unity

Please help me I am having a problem with uploading GoogleVR in Unity. Firstly, in the package window none of option get highlighted. Then below the screen I get these terrible errors CS0234 making it imagine that the program hasn’t assimilated my data. The 3rd photo shows that I am missing one option called GVRDemo option in the scenes folder.

I am facing these terrible glitches till today and I need them fixed now since I am taking an online course and I am going to get stuck behind if I don’t follow what the man is doing in the videos on Unity and I need more knowledge on how to use this.

if you are using this old plugin, it probably doesnt work in more recent unity versions.

you seem to use 2021.1 alpha version, try using the same unity version what they use in the tutorial, otherwise need to move into newer google vr plugin:
see info at top Google VR SDK for Unity  |  Google for Developers

*and even in that case, better use their recommended unity version, “Unity 2019.3.12f1 or later”,
unity alpha versions can be unstable and have new changes…