Do I have a defective LinuxCNC image?

Everything fails in odd ways.

( cut a slot width of mill )
O100 sub
( startx starty z feed endx endy)
#1 #2 #3 #4 #5 #6
G00 X #1 Y #2 Z #3
G00 x #5 Y #6
G00 x #1 Y #2 Z #3
O100 endsub
(lop through O100 incrementing z )
O200 sub
( startx starty startz endz stepz endx endy feed)
( #1 #2 #3 #4 #5 #6 #7 #8)
#9 = [#3 + #5]
if (#9 GT #4)
O200 return
O210 endif
O200 endsub
O200 call [-.125] [0.5] [0] [.25] [.01] [1.125] [.5] [1]
O200 call [.5] [-.125] [0] [.25] [.01] [.5] [1.125] [1]
m2

"Unknown word starting with f"

Thanks again. Each step hurts a bit but you GYS make it hurt less !