Do While problem

I am a newbie to Linux CNC. When I include the following in a file Linux CNC appears to lock up "spinning ball"
o303 do
#10=[#10+1]
g0 x#7 y[#9*#10] ;Move to next Y position
g0 z#11
g1 x#8
G0 z10
o303 while [[#9*#10] LT #2]

I cannot see my error! can anyone assist?

Thanks for the reply. #9 and #2 are initialized earlier in the file. the file did start as a "Subroutine" with the variables called. But I kept getting an error when I "called" and applied the variables. The whole file follows. It is probably incorrect in its action but I cannot get it to load and allow me to run it in the first place
g21
f200
(Milling the top face of a block)
(Clamp block then touch off using G54 on far right corner x and y and top of block)
(Stored parameters when called are #1 Length, #2 Width, #3 amount to remove, #4 cutter diameter #5 depth of cut #6 % width)
(#7 - #11 are also used)
(o300 call [x] [y] [z] [cutter dia] [cut depth] [cut width decimal fraction])
#1=20 #2=15 #3=3.5 #4=10 #5=1 #6=.8
#3=[0-#3] (Negate Z depth)
#7=3 (Far right X start postion)
#8=[#1+#4+3] (Far left end position value)
#8=[0-#8] ;negate
#9=[#4*#6] (Y increment)
#9=[0-#9] ;negate
#10=0 (Number of X passes)
#11=0 (Current Z position for cuts)

o301 while [#11 NE #3]
#11=[#11-#5]
o302 If [#11 LT #3]
#11=#3
o302 endif
#10=0
G0 z10 ;raise to clear height
o303 do
#10=[#10+1]
g0 x#7 y[#9*#10] ;Move to next Y position
g0 z#11
g1 x#8
G0 z10
o303 while [[#9*#10] LT #2]

o301 endwhile
G0 z10
G0 x0 y0

m2

Thanks for that John, I assumed that it was something like an infinite loop. I will do the debug (now that you have shown me how to use it!) I have also rewritten with "Named Parameters". The original software is fully indented but lost it in the copy and paste to the message. Thanks for your prompt help

Ok I have debugged and I cannot understand what is happening. In the code #10 resets to 0 after each iteration of "Do".I cannot understand it!

Ok file is attached