subroutine errors: Unknown g code used

filename: columns_and_rows.ngc
O<columns_and_rows> sub
(MSG, Inside sub!)
G17 G20 G54 G61 G40 G49 G80 G90
#<x_gap> = 1 (X increment between parts)
#<y_gap> = 1 (Y increment between parts)

#<x_count> = 6 (number of parts in X direction)
#<y_count> = 3 (number of parts in Y direction)

#<x_pos> = 0 (X location relative to G54, initialized to 0)
#<y_pos> = 0 (Y location relative to G54, initialized to 0)

(MSG, Step 2)
o200 while [#<y_pos> LT #<y_count>]
G52 Y#<y_pos>

o201 while [#<x_pos> LT #<x_count>]
G52 X#<x_pos>
G0X0.0000Y0.0000
G0X0.5625Y0.0000
G2 X0.5625 Y0.0000 I0.4375 J0 F40
#<x_pos> = [#<x_pos> + #<x_gap>]
o201 endwhile

#<x_pos> = 0
#<y_pos> = [#<y_pos> + #<y_gap>]
o200 endwhile
(MSG, Step 3)
(reset zero)
G52 Y0X0
G0X0.0000Y0.0000
(MSG, All done!)
O<columns_and_rows> endsub

M2