I'm trying To Get The Mouse.Target's Position The Whole Day, Can Somebody Help?

script.Parent.OnServerEvent:Connect(function(Block, Target, plr)
	local TargetPostion = Target.Position
	local RSBlock = game.ReplicatedStorage:FindFirstChild(Block)
	
	if plr.Blocks[Block].Value < 1 then
		print("You Don't Have That Block")
	else
		local RBlock = RSBlock:Clone()
		
		RBlock.Parent = game.Workspace
		if Target.Name == "BuildingFrame" then
			local ActualPosition = Target:GetPosition()
			
			RBlock.Position = Vector3.new(ActualPosition)
		end
	end
end)

So I Tried To Do Mouse.Target:GetPosition() Or Mouse.Target.Position, But None Of it Works! Please Help

First and foremost, GetPosition isn't a method of the mouse object

Mouse Object

In roblox, you can use the GetMouse() function on the client to get the mouse of the local player.

Like such:

local plr = game.Players.LocalPlayer
local Mouse = plr:GetMouse()

Mouse 3D position

If you want to get the 3D position of the mouse at any time, you would use the Hit property of the mouse, which is a CFrame value, then you can get the Position matrix of said cframe value.

For Example:

local plr = game.Players.LocalPlayer
local Mouse = plr:GetMouse()
print(Mouse.Hit.Position)--Vector3 position of the mouse

Position of the Mouse Target

On the other hand, if you want to get the position of the Mouse Target, which is an object or nil, instead of a cframe, you would do:

local plr = game.Players.LocalPlayer
local Mouse = plr:GetMouse()
print(Mouse.Target.Position)--Vector3 position of the mouse Target
print(Mouse.Target.CFrame.Position)--also works

Important Note: you can not get the mouse object on the server, as it doesn't replicate to the server, you can send over properties like target and Hit via remotes