add error logs in case the private fields are no longer there

Author: marcus-winter42

Packages/com.unity.inputsystem/InputSystem/Editor/Settings/EditorPlayerSettingHelpers.cs

@@ -164,11 +164,21 @@ private static SerializedProperty GetPropertyOrNull(string name)
             // this will be replaced by a call to an API in the editor instead of using reflection once it is available
             var buildProfileType = typeof(BuildProfile);
             var globalPlayerSettingsField = buildProfileType.GetField("s_GlobalPlayerSettings", BindingFlags.Static | BindingFlags.NonPublic);
+            if (globalPlayerSettingsField == null)
+            {
+                Debug.LogError($"Could not find global player settings field in build profile when trying to get property {name}. Please try to update the Input System package.");
+                return null;
+            }
             var playerSettings = (PlayerSettings)globalPlayerSettingsField.GetValue(null);
             var activeBuildProfile = BuildProfile.GetActiveBuildProfile();
             if (activeBuildProfile != null)
             {
                 var playerSettingsOverrideField = buildProfileType.GetField("m_PlayerSettings", BindingFlags.Instance | BindingFlags.NonPublic);
+                if (playerSettingsOverrideField == null)
+                {
+                    Debug.LogError($"Could not find player settings override field in build profile when trying to get property {name}. Please try to update the Input System package.");
+                    return null;
+                }
                 var playerSettingsOverride = (PlayerSettings)playerSettingsOverrideField.GetValue(activeBuildProfile);
                 if (playerSettingsOverride != null)
                     playerSettings = playerSettingsOverride;