Server RemoteEvent help?

I'm trying to hurt the player but I can't do this locally because of Filtering Enabled.

Error message: Unable to cast Instance to float | Script 'Workspace.GlobalInstances', Line 2 --receiving script

Sending script/Local:

local clickdeb = true

mouse.Button1Down:connect(function()
	if clickdeb then
		clickdeb = false
		if CheckAmmo() then
			currentamount = currentamount - 1
			spawn(function() bulletflash() updateammo() wait(.2) shootgui()  end)
			local bullet = shootbullet(shooter.CFrame.p, mouse.Hit.p)
			local hit    = ray(shooter.CFrame * CFrame.new(0,0,1), mouse.Hit.p)
			local damage = math.random(dmgmin,dmgmax)
			if hit then
				if hit.Name == "Head" then damage = damage * 3 end
				game.Workspace.GlobalInstances.HurtPlayer:FireServer(hit.Parent,damage)
				print("youshotsomething")
			end
		end
		wait(betweenshot)
		clickdeb = true
	end
end)

Normal script/Reciver:

script.HurtPlayer.OnServerEvent:connect(function(playertohurt,amount)
	game.Workspace[playertohurt.Name].Humanoid:TakeDamage(amount)
end)

View script in source to see the full thing

Your problem is a simple one I make a lot. The arguments for the OnServerEvent function are first 'player', representing the player who sent it, and then the arguments you passed.

Example

LocalScript

RemoteEvent.FireServer(1, "A")

ServerScript

RemoteEvent.OnServerEvent:connect(function(player, number, letter)
	print(player, number, letter)
end)
-- Output: playerWhoFiredEvent, 1, A 

Solution

Your fix is to simply add one more argument to the OnServerEvent function:

script.HurtPlayer.OnServerEvent:connect(function(player, playertohurt, amount)
    game.Workspace[playertohurt.Name].Humanoid:TakeDamage(amount)
end)