Index was outside of bounds of the array error:

[mikeny07]

I got the following error when generating the terrain:

IndexOutOfRangeException: Index was outside the bounds of the array.
ForestGenerator.Generate (System.Single[,] heightMap, UnityEngine.Vector3[] normals, System.Single waterLevel, System.Int32 seed) (at Assets/TerrainGenerator/MgeeGames/ProceduralTerrainGenerator/Scripts/ForestGenerator.cs:86)
TerrainMapGenerator.CreateForest (System.Single[,] heightMap, UnityEngine.Vector3[] terrainNormals) (at Assets/TerrainGenerator/MgeeGames/ProceduralTerrainGenerator/Scripts/TerrainMapGenerator.cs:270)
TerrainMapGenerator.Update () (at Assets/TerrainGenerator/MgeeGames/ProceduralTerrainGenerator/Scripts/TerrainMapGenerator.cs:151)
UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at <33518779906b403ba9f96eccba6a861b>:0)