Google Cardboard iOS rendering pink

Hi everyone, I am developing on Unity for iOS Google Cardboard, and the game looks fine when developing on my computer. However, when I try to put the game on my phone to test it, the entire screen is pink. I’ve seen others with this problem and have tried to reset the shaders, but that hasn’t worked for me. I’ve also checked to make sure that all the materials are present, which is something else that I saw could cause this problem. Any help at all would be greatly appreciated!

Update: this issue was solved by simply upgrading the version of Unity we were using to 2019.3.0f1