roblox error : AnimationID is not a valid member of Animation ?

Hi there. I'm trying to follow AlvinBLOX's tutorial on making a gun and keep running into this error : "AnimationID is not a valid member of Animation". Here's the code :

function checkBodyType(player,tool)-- checks whether the body(Torso) is R6 or R15
	if game.Workspace[player.Name]:FindFirstChild("LowerTorso") then 
		tool.shoot.AnimationID = "rbxassetid://1864601083" -- this is where the debugger points
		tool.reload.AnimationID = "rbxassetid://1864630409"
		return "R15"
	end
	if game.Workspace[player.Name]:FindFirstChild("Torso") then 
		tool.shoot.AnimationID = "rbxassetid://1864524552"
		tool.reload.AnimationID = "rbxassetid://1864538685"
		return "R6"
	end	
end 

Any idea what is the cause ? Thanks

function checkBodyType(player,tool)
	    if game.Workspace[player.Name]:FindFirstChild("LowerTorso") then
	        tool.shoot.AnimationId = "rbxassetid://1864601083" 
	        tool.reload.AnimationId = "rbxassetid://1864630409"
	        return "R15"
	    end
	    if game.Workspace[player.Name]:FindFirstChild("Torso") then
	        tool.shoot.AnimationId = "rbxassetid://1864524552"
	        tool.reload.AnimationId = "rbxassetid://1864538685"
	        return "R6"
	    end
	end

Try This.