Attempt to call global?

--Labels
left = game.Workspace.Left
Left = game.Workspace.Left
OntouchedL = game.Workspace.Left.Touched
right = game.Workspace.Right
Right = game.Workspace.Right
OntouchedR = game.Workspace.Right.Touched
JunctionOffice = game.Workspace.JO
Brandate = game.Workspace.BD
MetroPoint = game.Workspace.MP
OntouchedJO = game.Workspace.JO.Touched
OntouchedBD = game.Workspace.BD.Touched
OntouchedMP = game.Workspace.MP.Touched
MPBound = game.Workspace.MPBound
JOBound = game.Workspace.JOBound
OntouchedMPB = game.Workspace.MPBound.Touched
OntouchedJOB = game.Workspace.JOBound.Touched

---------------------------------------------------------
--Functions
function Blink()
	if OntouchedL(Left) then
		script.Parent.Parent.Right.DOTS.DOTS1.Blink.Disabled = true
		script.Parent.Parent.Right.DOTS.DOTS2.Blink.Disabled = true
		script.Parent.Parent.Left.DOTS.DOTS1.Blink.Disabled = false
		script.Parent.Parent.Left.DOTS.DOTS2.Blink.Disabled = false
	end
	if OntouchedR(Right) then
		script.Parent.Parent.Right.DOTS.DOTS1.Blink.Disabled = true
		script.Parent.Parent.Right.DOTS.DOTS2.Blink.Disabled = true
		script.Parent.Parent.Left.DOTS.DOTS1.Blink.Disabled = false
		script.Parent.Parent.Left.DOTS.DOTS2.Blink.Disabled = false
	end
end

function Station()
	if OntouchedJO(JunctionOffice)then
		script.Parent.Parent.Right.Station.JO.Script.Disabled = false
		script.Parent.Parent.Right.Station.BD.script.Disabled = true
		script.Parent.Parent.Right.Station.MP.Script.Disabled = true
	end
	if OntouchedBD(Brandate)then
		script.Parent.Parent.Right.Station.JO.Script.Disabled = true
		script.Parent.Parent.Right.Station.BD.script.Disabled = false
		script.Parent.Parent.Right.Station.MP.Script.Disabled = true
	end
	if OntouchedMP(MetroPoint)then
		script.Parent.Parent.Right.Station.JO.Script.Disabled = true
		script.Parent.Parent.Right.Station.BD.script.Disabled = true
		script.Parent.Parent.Right.Station.MP.Script.Disabled = false
	end
end

function Terminal()
	if OntouchedMPB (MPBound)then
		script.Parent.Parent.Right.Bounds.MPBound1.BrickColor = BrickColor.new("New Yeller")
		script.Parent.Parent.Right.Bounds.MPBound2.BrickColor = BrickColor.new("New Yeller")
		script.Parent.Parent.Left.Bounds.JOBound1.BrickColor = BrickColor.new("Medium stone grey")
		script.Parent.Parent.Left.Bounds.JOBound2.BrickColor = BrickColor.new("Medium stone grey")
	end
	if OntouchedJOB(JOBound)then
		script.Parent.Parent.Right.Bounds.MPBound1.BrickColor = BrickColor.new("Medium stone grey")
		script.Parent.Parent.Right.Bounds.MPBound2.BrickColor = BrickColor.new("Medium stone grey")
		script.Parent.Parent.Left.Bounds.MPBound1.BrickColor = BrickColor.new("New Yeller")
		script.Parent.Parent.Left.Bounds.MPBound2.BrickColor = BrickColor.new("New Yeller")
	end
end

---------------------------------------------------------------------------------
--Connection
script.Parent.Touched:connect(Blink)
script.Parent.Touched:connect(Station)
script.Parent.Touched:connect(Terminal)

I was working on a Dynamic Route Map Display for my friend but the output said (ignore the timings)

"17:21:34.956 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:21:34.957 - Stack Begin 17:21:34.957 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:21:34.958 - Stack End 17:21:34.959 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:21:34.960 - Stack Begin 17:21:34.961 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:21:34.961 - Stack End 17:21:35.907 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:21:35.909 - Stack Begin 17:21:35.909 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:21:35.910 - Stack End 17:21:35.911 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:21:35.912 - Stack Begin 17:21:35.913 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:21:35.913 - Stack End 17:21:36.032 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:21:36.033 - Stack Begin 17:21:36.033 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:21:36.034 - Stack End 17:21:36.035 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:21:36.036 - Stack Begin 17:21:36.036 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:21:36.037 - Stack End 17:21:47.247 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:21:47.248 - Stack Begin 17:21:47.249 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:21:47.250 - Stack End 17:21:47.251 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:21:47.252 - Stack Begin 17:21:47.252 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:21:47.253 - Stack End 17:21:47.278 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:21:47.279 - Stack Begin 17:21:47.281 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:21:47.282 - Stack End 17:21:47.283 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:21:47.283 - Stack Begin 17:21:47.284 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:21:47.285 - Stack End 17:21:54.339 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:21:54.340 - Stack Begin 17:21:54.341 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:21:54.341 - Stack End 17:21:54.341 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:21:54.342 - Stack Begin 17:21:54.343 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:21:54.344 - Stack End 17:22:05.984 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:22:05.985 - Stack Begin 17:22:05.986 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:22:05.987 - Stack End 17:22:05.989 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:22:05.990 - Stack Begin 17:22:05.990 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:22:05.990 - Stack End 17:22:13.681 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:22:13.683 - Stack Begin 17:22:13.684 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:22:13.686 - Stack End 17:22:13.686 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:22:13.687 - Stack Begin 17:22:13.689 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:22:13.689 - Stack End 17:22:14.645 - Workspace.DRMD.DRMDSensor.Master:55: attempt to call global 'OntouchedMPB' (a userdata value) 17:22:14.646 - Stack Begin 17:22:14.647 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 55 17:22:14.648 - Stack End 17:22:14.650 - Workspace.DRMD.DRMDSensor.Master:37: attempt to call global 'OntouchedJO' (a userdata value) 17:22:14.651 - Stack Begin 17:22:14.651 - Script 'Workspace.DRMD.DRMDSensor.Master', Line 37 17:22:14.652 - Stack End"