G12.1 Alarm 1802

So I just changed our post to use polar interpolation for drilling on the face of parts so it'll be easier for the programmer. Anyhow now the machine gives me an alarm 1802 "Illegal start up" on the second drilling operation in a row. Here's the code any ideas whats wrong?

N00282 (******************** M6_CENTERDRILL ********************)
N00283 ()
N00284 G28 U0.
N00285 G28 V0. W0.
N00286 G28 B0.
N00287 M901
N00288 M200
N00289 G122.1
N00290 T26 T10 M6 (*** 9.5MM_CENTERDRILL *** D9.50000000000000000 mm ***)
N00291 M250
N00292 G0 B0.0
N00293 M251
N00294 G53.5 Z#9101+#503 C#9102+#507
N00295 M212
N00296 G0 C0.0
N00297 M211
N00298 G97 S3000 M203 M8
N00299 G0 C0.
N00300 G17UH
N00301 G12.1
N00302 G122.1
N00303 ( Polar Output )
N00304 X-49.793 C-41.781 Z3.
N00305 G98 G83 X-49.793 C-41.781 Z-3.2 R0.0 Q5000. F300.
N00306 X-11.287 C-64.013 Z-3.2 R0.0 Q5000.
N00307 X61.08 C-22.231 Z-3.2 R0.0 Q5000.
N00308 X61.08 C22.231 Z-3.2 R0.0 Q5000.
N00309 X-11.287 C64.013 Z-3.2 R0.0 Q5000.
N00310 X-49.793 C41.781 Z-3.2 R0.0 Q5000.
N00311 G80
N00312 M9
N00313 G13.1
N00314 G28 U0.
N00315 (Step Run Time 0.68 Minutes)
N00316 (Total Run Time 4.89 Minutes)
N00317 ()
N00318 (******************** M6_DRILL ********************)
N00319 ()
N00320 G28 U0.
N00321 G28 V0. W0.
N00322 G28 B0.
N00323 M901
N00324 M200
N00325 G122.1
N00326 T10 T11 M6 (*** 5.0MM_DRILL *** D5.00000000000000000 mm ***)
N00327 M250
N00328 G0 B0.0
N00329 M251
N00330 G53.5 Z#9101+#503 C#9102+#507
N00331 M212
N00332 G0 C0.0
N00333 M211
N00334 G97 S4851 M203 M8
N00335 G0 C0.
N00336 G17UH
N00337 G12.1 (*********Alarms on this line ****************)
N00338 G122.1
N00339 ( Polar Output )
N00340 X-49.793 C-41.781 Z3.
N00341 G83 X-49.793 C-41.781 Z-28.502 R0.0 Q5000. F370.
N00342 X-11.287 C-64.013 Z-28.502 R0.0 Q5000.
N00343 X61.08 C-22.231 Z-28.502 R0.0 Q5000.
N00344 X61.08 C22.231 Z-28.502 R0.0 Q5000.
N00345 X-11.287 C64.013 Z-28.502 R0.0 Q5000.
N00346 X-49.793 C41.781 Z-28.502 R0.0 Q5000.
N00347 G80
N00348 M9
N00349 G13.1
N00350 G28 U0.

Hmm you use G122.1 in G12.1 mode; I don't think this is allowed; I had some surprising experiences with that before; Try it without G122.1 and see what you get;

fooo is right, you can't use g122.1, because in G12.1 are allways diametral inputs.

MM

G122.1 works with G12.1 on my machine just fine, I've used that alot. It's a 200IVS w/ Matrix.
I figuired out the problem anyhow. If the last hole drilled is at a negative X or C I have to move it to a positive location BEFORE I cancell 12.1. I just force the post to always output something like G0 X150. C0. right before G13.1 and everything works good!