Trying to run first job but machine stops

Hi everyone.

I have just got everything set up but I am having trouble with the following;

Using Gen 6 electronics, Marlin firmware and Pronterface.

If I send a Gcode file that I would have done for 3D printing everything works fine.

However, any G code that is used for CNC milling does not work? I just get a huge list of unknown commands and nothing happens?

Attached is the sample G code others have used for their first run.

Any help would be appreciated.

Abit more information.

I believe it is something to do with how I generate the G-code.

Using Skeinforge to slice some STl files seems to work so would I be correct in thinking that there must be a communication issue between my GEN 6 electronics and the way CNC G code generators export their code?
Thanks

There are a few things with the gcode that you posted that make it incompatible with Marlin. Comments need to be prefaced with a semicolon (not parentheses). Every line that isn't a comment needs to start with a command, such as a Gnn, Mnn, or Tnn. Another issue is that the dwell command (G4) that Marlin expects is in milliseconds, where it appears that the gcode has it in seconds.

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