Mazak 300MSY Alarm 1803

Hi everybody
I want to use mill mode with sub spindle.
When I run nc program, it show alarm 1803 on the screen.
The NC code is like below.

G21
G28 U0
G28 W0.
T0303
N1 (C2_Z)
(TOOL = EM6)
M902
G110 C2
M312
M300
G40 G80 G90 G98
S500 M203
G54
G00 C0.0
Z-13.
X21. Y0.0
M08
Z-3.
G01 Z0.0 F350.
X18. ------------------------- Machine stop at this block.
X25.456 C45.
C135.
C225.
C315.
X18. C0.0

The machine don't have G12.1 function.
I have no idea what's going on.
How could I fix this issue?
Thank you.