Issue with Google Cardboard XR plugin

Hi, i am trying to implement google cardboard XR plugin in one of my project. But i am getting an error

Why am I getting this error? I have other projects in which I am using the same plugin, but no issues found.

in the project XR settings, do you have [×] initialize on startup enabled? (probably should)

Yes it is enabled.

Coming from their example script CardboardStartup.cs,
i didnt use that on my cardboard app, i think had similar error messages from the sample scenes and scripts.

but can check or report here Issues · googlevr/cardboard · GitHub

thank you for the reply. the issue is with hellocardboard scene (CardboardStartup.cs). VRmode scene has no issues, currently using this. are there any alternatives for cardboard

i hope there would be, im also interested to know…

asset store has few like Cardboard.NET (VR solution) | Camera | Unity Asset Store
but might be risky if they dont get upgraded?

theres also this reply from unity,

although someone mentioned that maybe you can use unity XR alone for mobile vr (basically to get tracking and 2 eyes), havent had time to check if thats possible…