Xcode build says succeed but unityframework gives thousands of errors and game does not start on the phone.,Xcode build errors.

Hi. when I build my game for xcode it says Build succeeded but UnityFramework gives thousands of errors. When I try code even with a simple scene with just an spinning cube. it is the same. Can you please help to solve this issue. My game works without any errors in Unity but absolute chaos when building for ios.