implementing tflite with arfoundation?

I checked how to implement image classification with arfoundation
and I found out https://qiita.com/cvusk/items/77d5afef76447d173f02

it also provide with github repository link but failed to run it.
so, I made my own new project then move all the files to my new project folder
but on android device, it keep show error on

detector.Invoke(cameraTexture);

error is
NullReferenceException Object reference not set to an instance of an object

it seems cameraTexture is null…

anyone success in run above example?

it resolved it by myself, I didn’t do anything but it suddenly become not null…