How do I fix this problem-it won't let me start my game in Unity because of an override problem

The override problem isn't letting me start my game and it is coming from a UnityScript that I was in the game, when I started the map. The error is:

"/Applications/Unity/Hub/Editor/2019.4.5f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/ScrollRect.cs(605,30): error CS0115: 'ScrollRect.IsActive()': no suitable method found to override"

The line is:

public override bool IsActive()

(i've attached a photo of the words around this line in the script)