请老师帮我看一下，为何这个程序走不下去

%
O0001(D1/D-12.  / FLATMILL )
(T.NC)
(VERALL MAX -  Z1. )
(VERALL MIN -  Z0. )
/X0Y0M99
G90G92X0.Y0.Z60.
G17G00
G00 G90 X2.853 Y-29.103
Z1.
Z0.1
G01 Z0. F30.
G41 D1 X4.757 Y-26.785 F600.
G03 X5.439 Y-24.881 R3.
X2.439 Y-21.881 R3.
X2.146 Y-21.895 R3.
G01 X-38.463 Y-25.876
G02 X-41. Y-26. R26.
X-67. Y0. R26.
X-41. Y26. R26.
X-38.463 Y25.876 R26.
G01 X42.756 Y17.914
G02 X59. Y0. R18.
X42.756 Y-17.914 R18.
G01 X2.146 Y-21.895
G03 X-0.561 Y-24.881 R3.
X0.535 Y-27.199 R3.
G01 G40 X2.853 Y-29.103
G00 Z1.
G00Z60.
X0.Y0.
G91X0Y0
M99
%