You'll need to update the Assets/FSP/MAST/Scripts/Settings/ScriptObj/GUI.cs file if you use Unity 6:
using System;
using UnityEngine;
#if (UNITY_EDITOR)
namespace MAST
{
namespace Settings
{
namespace ScriptObj
{
[Serializable]
public class GUI : ScriptableObject
{
[SerializeField] public Grid grid;
[Serializable] public class Grid
{
[SerializeField] public float xzUnitSize = 1f;
[SerializeField] public float yUnitSize = 1f;
[SerializeField] public int cellCount = 50;
[SerializeField] public int gridHeight = 0;
[SerializeField] public Color tintColor = new Color32(255, 255, 255, 127);
public float yPos()
{
return gridHeight * yUnitSize;
}
}
[SerializeField] public Palette palette;
[Serializable] public class Palette
{
[SerializeField] public PaleteBGColor bgColor = PaleteBGColor.Dark;
[SerializeField] public float snapshotCameraPitch = 225f;
[SerializeField] public float snapshotCameraYaw = 30f;
[SerializeField] public bool overwriteThumbnails = false;
}
[SerializeField] public Toolbar toolbar;
[Serializable] public class Toolbar
{
[SerializeField] public int selectedDrawToolIndex = -1;
[SerializeField] public int selectedPaintToolIndex = -1;
[SerializeField] public ToolbarPos position = ToolbarPos.Left;
[SerializeField] public float scale = 1f;
}
}
}
}
}
#endif