Vuforia White screen error

Hi, I'm having a white screen error and ı would really appreciate some help. I am using the vuforia engine, ı have a 2D "Start canvas" where the user writes their name, and then when they hit the "Start" button the AR camera is supposed to become active. The project works fine on PC but, when ı build the app for android the start canvas opens up, then I hit the start button and I get a white screen. is it about the shaders ? or is there some setting that I am missing I don't know :( I am using Xiaomi Pocco X3 Pro, but I also tried the app on Samsung Fan Edition note 7. same results and ı don't have errors on the console

Unity 2019.4.17f1 LTS