isCursorOnElement help me plz

[Alex_McWhit]

addEventHandler( "onClientClick", getRootElement(), function(button, state )
				if ( button == "left" and state == "up" ) then
		if ( isCursorOnElement(288, 424, 211, 61))  then 
		SpawnPlayer()
		end 
	end
end)

this function isCursorOnElement dosen't wrok help me plz 

attempt to call global isCursorOnElement a nil value 

Edited December 25, 2017 by Alex_McWhit

[Dimos7]

Do you have copy the code in wiki because it a usefuel function?