I apologize If there is already a post on this I just found it hard to find with my limited knowledge on the subject.

-What I have-
Mastercam X2
Haas SR-100 Gantry

-Question-
I have tried a few of the default Default Routers that might apply to my machine in "Machine Types" menu but after I plot my tool paths and post the G code I get some extra code that errors my machine. I get the command G8 and I don't believe that's defined in my machine. I could be wrong I am very new to this and it's my first machine. If I delete the trouble code out it works fine but I would like to find a solution that will have Mastercam post it correctly the first time. Any ideas?

-Possible Solutions?-
1. From what I read it seems like the post-processor is what posts this code but I wasn't able to figure out how to edit it to my machine.
2. It would seem that all the CNC Router "Machine Type" files are ".RMD" files. Would I be able to download a .RMD file for a Haas Router for free?