Unable to Build for iOS

Hello, I have just started working on unity projects that were built to be used on android and iOS, I am able to build for android but everytime I switch platform to iOS I got blocked, sometimes I am able to build the project but it found incomplet once on xcode, and sometimes I got an error while building the project, can you help figuring out what I am doing wrong in the iOS side especially I am new to this... I have 10 errors line like this once I run the game on unity :

NullReferenceException: Object reference not set to an instance of an object UnityEditor.DockArea.OnGUI () (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:272)

And once I try to build it I have these 3 lignes of errors:

Assets/GameManager.cs(324,39): error CS0246: The type or namespace name ShowResult' could not be found. Are you missing a using directive or an assembly reference? Assets/Runner/Scripts/CoinDialog.cs(38,39): error CS0246: The type or namespace name ShowResult' could not be found. Are you missing a using directive or an assembly reference?

Error building Player because scripts had compiler errors

Please help