I upgraded my project from 2018.1.f1 to 2018.20f2. There are two errors after the upgrade: Assets/TextMesh Pro/Examples/Scripts/TMP_DigitValidator.cs(12,39): error CS0246: The type or namespace name `TMP_InputValidator' could not be found. Are you missing an assembly reference? and Assets/Scripts/PlayerControl/PlayerController.cs(83,13): error CS1070: The type `UnityEngine.CharacterController' has been forwarded to an assembly that is not referenced. Enable the built in package 'Physics' in the Package Manager window to fix this error. My Winndow menu looks like this: So, there is no way to open Package Manager and enable "Physics" package. Please help. What should i do?