G Code -- !Error: Failed to post data

Getting an error when using Fusion 360, and the latest Easel Post Processor (April 8, 2016 - f360-easel-f5c756b7d1f4af99e56f8affb88de2ca).

I have two tools, so I’m exporting each separately. One tool processes fine, but the other does not. It begins to process, then stops after an M9 command. The job is pretty simple, drilling and contour.

Here’s what it creates:
G90G94
G17
G20

(TOOL/MILL,0.125,0,0.5,0)
(STOCK/BLOCK,4.75,3.83,0.22,0, 0, 0)
M9
T1M6
S25000M3
G54
M9
!Error: Failed to post data.

…and here’s what it creates when using a generic GRBL post:
%
(1)
(T1 D=0.125 CR=0 - ZMIN=-0.22 - flat end mill)
G90 G94
G17
G20
G0 Z1

(Drill1)
M9
T1 M6
S25000 M3

…+200 more lines
Any ideas?

It could be choking on this. I have had UGS error on M6 commands, not always, just sometimes. :unamused:
I had assumed it was a UGS issue but maybe it is a GRBL issue with M6?

The M6 is not needed as it is for an automatic tool changer which the XC doesn’t have.
I think most post processors put it in anyway so that when you manual read the gCode you have some kind of reference to what bit was used.

So see if you can manually edit your post processor to remove the M6 command an re-run the code.
I hope this was helpful.