What's does (attempt to index nil with 'WalkSpeed') mean? Script 4.

It said "Players.tecknobladee.Backpack.TheSwordName.Script:4: attempt to index nil with 'WalkSpeed'" How do I fix it?

script.Parent.Equipped:Connect(function(char)
	local h = char:WaitForChild("LocalPlayer",10)
	h.WalkSpeed = h.WalkSpeed * 1.20
end)

The reason it didn't work, is cause when you Say Char its not the character, its the players mouse

so the solution is easy when you equip the tool, the tool goes into the character so we can say local Character = script.Parent.Parent then we can adjust the walk speed Character.Humanoid.WalkSpeed = Character.Humanoid.WalkSpeed * 1.2

Note: attempt to index nil means that the property you are getting dosn't exist

script.Parent.Equipped:Connect(function(PlayerMouse)
	local Character = script.Parent.Parent
	Character.Humanoid.WalkSpeed = Character.Humanoid.WalkSpeed * 1.2
end)

Local player is not a member of character character is a member of local player

script.Parent.Equipped:Connect(function(char)
     local h = char:WaitForChild("Humanoid",10) — I’m assuming char is character
     h.WalkSpeed = h.WalkSpeed * 1.20
end)