unknown G code used

G0 G90 G54 G17 G40 G49 G80
T1 M6
S2500 M3
G0 X3.0 Y0.0
G43 H1 Z.5
G94
G1 Z0.0 F10.0
G3 X1.0 Y2.0 I-2.0 J0.0 F10.0
G0 Z.5
G0 G53 Z0.0
M30




where i have problem?

Try this;

G0 G90 G54 G17 G40 G49 G80
G90.1
T1 M6
S2500 M3
G0 X3.0 Y0.0
G43 H1 Z.5
G94
G1 Z0.0 F10.0
G3 X1.0 Y2.0 I-2.0 J0.0 F10.0
G0 Z.5
G0 G53 Z0.0
M30
%

Tweakie.

G0 G90 G54 G17 G40 G49 G80
G90.1
T1 M6
S2500 M3
G0 X3.0 Y0.0
G43 H1 Z.5
G94
G1 Z0.0 F10.0
G3 X1.0 Y2.0 I-2.0 J0.0 F10.0
G0 Z.5
G0 G53 Z0.0
M30
%

i deleted G90 and it work, but problem now on

G0 X3.0 Y0.0

 next unknown G code used

Your Gcode runs just fine here so I am out of suggestions, sorry. 

Tweakie.

I know this is a real old post.  But I had the same problem and was searching for a solution and found this post.

I finally figured out what my problem was. So I thought I'd post my solution here. 

I assumed the only real difference between Mach4Lathe and Mach4Mill was screensets used.  That doesn't appear to be the case. I had copied a customized Mach4Lathe profile for a mill profile then changed the screenset to wx4.set.  My new mill profile wouldn't recognize code G90.

However when I started from scratch and copied Mach4Mill for my new mill profile. It would now recognize G90 just fine.