ERROR: Message '@' not understood.
RECEIVER:
   nil
ARGS:
   Float 142.000000   00000001 4061C000
CALL STACK:
	DoesNotUnderstandError:reportError
		arg this = <instance of DoesNotUnderstandError>
	Nil:handleError
		arg this = nil
		arg error = <instance of DoesNotUnderstandError>
	Thread:handleError
		arg this = <instance of Thread>
		arg error = <instance of DoesNotUnderstandError>
	Object:throw
		arg this = <instance of DoesNotUnderstandError>
	Object:doesNotUnderstand
		arg this = nil
		arg selector = '@'
		arg args = [*1]
	< FunctionDef in Method Plot:linear >
		arg i = 417
	Integer:do
		arg this = 418
		arg function = <instance of Function>
		var i = 417
	Plot:linear
		arg this = <instance of Plot>
		arg x = [*417]
		arg y = [*418]
	< FunctionDef in Method Plot:drawData >  (no arguments or variables)
	Meta_Pen:use
		arg this = <instance of Meta_Pen>
		arg aFunction = <instance of Function>
	Plot:drawData
		arg this = <instance of Plot>
		var mode = 'linear'
		var ycoord = [*418]
		var xcoord = [*417]
	Plot:draw
		arg this = <instance of Plot>
	ArrayedCollection:do
		arg this = [*1]
		arg function = <instance of Function>
		var i = 0
	Meta_Pen:use
		arg this = <instance of Meta_Pen>
		arg aFunction = <instance of Function>
	Plotter:draw
		arg this = <instance of Plotter>
		var b = <instance of Rect>
	UserView:doDrawFunc
		arg this = <instance of UserView>
^^ The preceding error dump is for ERROR: Message '@' not understood.
RECEIVER: nil