App works on IOS simulator but doesn't work on actual device

I have a unity project that works fine on the IOS simulator in Xcode, but when I try and build it on a real device, I get this error and a SIGABRT on thread 1 dyld: Symbol not found: _MTLTextureDescriptorClass Referenced from: /var/containers/Bundle/Application/D5CD2236-2F35-4F58-9630-78B29666E003/nameofapp.app/nameofapp Expected in: flat namespace in /var/containers/Bundle/Application/D5CD2236-2F35-4F58-9630-78B29666E003/nameofapp.app/nameofapp (lldb)