Strange subroutine error

[code]o<drill1> sub (info: Drilling bottom edge with horizontal spindle) #<X_Coord> = #1 (X Coordinate) #<Y_Coord> = #2 (Y Coordinate) #<Z_Coord> = #3 (Z Coordinate) #<Safe_Z> = #4 (=0 Safe Z height) #<Y_StepBack> = #5 (= 5 Step back from edge along Y) #<Bore_depth> = #6 (=20 Depth) #<FeedRate> = #7 (=300 Feedrate mm/min) #<ToolNumber> = #8 (=1 Tool Number) #<Peck> = #9 (=6 Peck Increment) #<X_Park> = #10 (=0 X Park) #<Y_Park> = #11 (=0 Y Park) ;set global parameters ;#<_remain_depth> = #<Bore_depth> ;#<_temp_depth> = 0 T#<ToolNumber> M6 G43 T#<ToolNumber> #<remain_depth> = #<Bore_depth> #<temp_depth> = 0 S100 M3 F#<FeedRate> G0 Z#<Safe_Z> G0 X#<X_Coord> Y[#<Y_Coord> - #<Y_StepBack>] G0 Z#<Z_Coord> o<y100> while [#<remain_depth>]     o<y1100> if [#<remain_depth> GT #<Peck>]       #<temp_depth> = [#<temp_depth> + #<Peck>]       G1 Y[#<Y_Coord> + #<temp_depth>]       G1 Y#<Y_Coord>       #<remain_depth> = [#<remain_depth> - #<Peck>]      o<y1100> else         #<remain_depth> = 0         G1 Y[#<Y_Coord> + #<Bore_depth>]         G1 Y[#<Y_Coord> - #<Y_StepBack>]     o<y1100> endif o<y100> endwhile G0 Z#<Safe_Z> o<drill1> endsub

[code]Here is the error message:

[code][code][code][code]Near line 57 of /home/cnc/linuxcnc/nc_files/0.auto.ngc: 57:duplicate O-word label: 'o<001y1100> while [#<remain_depth>]' - defined in line 52

[code][code][code][code]Here is the 0.auto.ngc file that was generated by ngcgui:

[code][code][code][code][code][code][code][code](pyngcgui: FEATURE 210904:14.53.47) (pyngcgui: files: </home/cnc/linuxcnc/nc_files/ngcgui_lib/utilitysubs/mm_std.ngc,/home/cnc/linuxcnc/nc_files/drill1.ngc,>;) (pyngcgui: feature line added) #<_feature:> = 0 (pyngcgui: remaining_features line added)  #<_remaining_features:> = 0 (pyngcgui: preamble file: /home/cnc/linuxcnc/nc_files/ngcgui_lib/utilitysubs/mm_std.ngc) g17 (xy plane) g21 (mm) g40 (cancel cutter radius compensation) g49 (cancel tool lengthoffset) g90 (absolute distance mode) g94 (units/min feedrate) g54 (Coordinate system 1 default) #<tol>  = 0.001 g64 p#<tol> (path control stop) (Positional parameters for /home/cnc/linuxcnc/nc_files/drill1.ngc)         #1 = 50         #2 = 15         #3 = 9         #4 = 0         #5 = 5         #6 = 20         #7 = 300         #8 = 1         #9 = 6         #10 = 0         #11 = 0 (expanded file: /home/cnc/linuxcnc/nc_files/drill1.ngc)             (info: Drilling bottom edge with horizontal spindle)             #<X_Coord> = #1 (X Coordinate)             #<Y_Coord> = #2 (Y Coordinate)             #<Z_Coord> = #3 (Z Coordinate)             #<Safe_Z> = #4 (=0 Safe Z height)             #<Y_StepBack> = #5 (= 5 Step back from edge along Y)             #<Bore_depth> = #6 (=20 Depth)             #<FeedRate> = #7 (=300 Feedrate mm/min)             #<ToolNumber> = #8 (=1 Tool Number)             #<Peck> = #9 (=6 Peck Increment)             #<X_Park> = #10 (=0 X Park)             #<Y_Park> = #11 (=0 Y Park)             ;set global parameters             ;#<_remain_depth> = #<Bore_depth>             ;#<_temp_depth> = 0             T#<ToolNumber> M6             G43 T#<ToolNumber>             #<remain_depth> = #<Bore_depth>             #<temp_depth> = 0             S100 M3 F#<FeedRate>             G0 Z#<Safe_Z>             G0 X#<X_Coord> Y[#<Y_Coord> - #<Y_StepBack>]             G0 Z#<Z_Coord>  o<001y100>  while [#<remain_depth>] o<001y1100>  while [#<remain_depth>]                   #<temp_depth> = [#<temp_depth> + #<Peck>]                   G1 Y[#<Y_Coord> + #<temp_depth>]                   G1 Y#<Y_Coord>                   #<remain_depth> = [#<remain_depth> - #<Peck>] o<001y1100>  while [#<remain_depth>]                     #<remain_depth> = 0                     G1 Y[#<Y_Coord> + #<Bore_depth>]                     G1 Y[#<Y_Coord> - #<Y_StepBack>] o<001y1100>  while [#<remain_depth>]  o<001y100>  endwhile             G0 Z#<Safe_Z> (pyngcgui: m2 line added) m2 (g54 activated)