I got an error in the console:

[13:18:34] [Main Thread/WARN] [tML]: Silently Caught Exception:
System.MissingMethodException: Method not found: 'Void Terraria.Player.QuickSpawnItem(Int32, Int32)'.
at PickBlock.PickBlockPlayer.GiveItem(Int32 tileItemID)
at PickBlock.PickBlockPlayer.GiveTile(Tile tile) in PickBlockPlayer.cs:line 37
at Terraria.ModLoader.PlayerLoader.ProcessTriggers(Player player, TriggersSet triggersSet) in tModLoader\Terraria\ModLoader\PlayerLoader.cs:line 515
at Terraria.GameInput.TriggersSet.CopyInto(Player p) in tModLoader\Terraria\GameInput\TriggersSet.cs:line 603
at Terraria.Player.Update(Int32 i) in tModLoader\Terraria\Player.cs:line 17906
at Terraria.Main.DoUpdateInWorld(Stopwatch sw) in tModLoader\Terraria\Main.cs:line 13387
at DMD<Terraria.Main::DoUpdate>(Main this, GameTime& gameTime)
at Creativetools.src.Tools.TimeControl.TimeControl.Main_DoUpdate(orig_DoUpdate orig, Main self, GameTime& gameTime)
at Terraria.Main.Update(GameTime gameTime)
at Microsoft.Xna.Framework.Game.Tick()
at Microsoft.Xna.Framework.Game.RunLoop()
at Microsoft.Xna.Framework.Game.Run()
at Terraria.Program.LaunchGame_(Boolean isServer)
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs)
at MonoLaunch.Main(String[] args)

Now, nothing happens when I middle-click a block.