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I'm trying to write a post processor and can't get it to work (1.5 beta2) on either OS X or Windows 8. I've distilled it down to a trivial script and it fails with this message: "Failed, returning 512". The error dialog that pops up shows the correct path to my python script and the gcode file path.

It fails in the same way on version 1.4.1.12.

I can run the script from the command line with no problems. There must be some config or permissions problem. What is the 512 error code?

You know, I've been struggling with this problem for a couple of days. I just running my script from the command line and realized it is executed as pythonw /....../scriptname.py "<FILE>"

Doh! need to include the interpreter in the post processor command line. It works fine now.