VSPro grass green, blue, alpha channels not working

I generated grass using Texture Masks rules. The Red channel works ok in the editor, but for some reason the Green, Blue and Alpha throw an error that stops the terrains from generating: Thread failed: System.IndexOutOfRangeException: Index was outside the bounds of the array. at MapMagic.VegetationStudio.VSProMapsOut.Finalize (MapMagic.Products.TileData data, MapMagic.Products.StopToken stop) [0x000f9] in D:\Dropbox\GameDev\Projects\NewProject\Assets\MapMagic\Compatibility\VegetationStudio\VSProMapsOut.cs:77 at MapMagic.Nodes.Graph.Finalize (MapMagic.Products.TileData data, MapMagic.Products.StopToken stop) [0x00088] in D:\Dropbox\GameDev\Projects\NewProject\Assets\MapMagic\Nodes\Graph.cs:805 at MapMagic.Terrains.TerrainTile.Generate (MapMagic.Nodes.Graph graph, MapMagic.Terrains.TerrainTile tile, MapMagic.Terrains.TerrainTile+DetailLevel det, MapMagic.Products.StopToken stop) [0x0007c] in D:\Dropbox\GameDev\Projects\NewProject\Assets\MapMagic\Terrains\TerrainTile.cs:689 at MapMagic.Terrains.TerrainTile+<>c__DisplayClass37_1.<StopEnqueueTask>b__0 () [0x00000] in D:\Dropbox\GameDev\Projects\NewProject\Assets\MapMagic\Terrains\TerrainTile.cs:641 at Den.Tools.Tasks.ThreadManager.TaskThreadAction (Den.Tools.Tasks.ThreadManager+Task task) [0x00002] in D:\Dropbox\GameDev\Projects\NewProject\Assets\MapMagic\Tools\ThreadManager\ThreadManager.cs:133 UnityEngine.Debug:LogError(Object) Den.Tools.Tasks.ThreadManager:TaskThreadAction(Task) (at Assets/MapMagic/Tools/ThreadManager/ThreadManager.cs:136) System.Threading.ThreadHelper:ThreadStart()