executing
A failed Python prolog returning INTERP_ERROR
O <notcalled> call 
    1 N..... USE_LENGTH_UNITS(CANON_UNITS_MM)
    2 N..... SET_G5X_OFFSET(1, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000)
    3 N..... SET_G92_OFFSET(0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000)
    4 N..... SET_XY_ROTATION(0.0000)
    5 N..... SET_FEED_REFERENCE(CANON_XYZ)
    6 N..... MESSAGE(" before M400: call_level= 0.000000 remap_level=0.000000")
    7 N..... MESSAGE("failingprolog returning INTERP_ERROR")
    8 N..... MESSAGE(" after failed M400: call_level= 0.000000 remap_level=0.000000")
    9 N..... SET_G5X_OFFSET(1, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000)
   10 N..... SET_XY_ROTATION(0.0000)
   11 N..... SET_FEED_MODE(0)
   12 N..... SET_FEED_RATE(0.0000)
   13 N..... STOP_SPINDLE_TURNING()
   14 N..... SET_SPINDLE_MODE(0.0000)
   15 N..... PROGRAM_END()