If you get Error 201 in OSX when you're working with RayWare, try the following steps:
Turn off MoonRay and close RayWare.
Unplug the USB and HDMI cables from your computer.
Turn on MoonRay and open RayWare.
Plug the HDMI and USB cables back in to your computer.
Try printing your model again.
If this didn't help, try the following steps:
Make sure MoonRay is turned on. (You might notice your screen blinks when you turn the machine on.)
Go to System Preferences -> Displays
Go to "Arrangement" tab and click on "Gather Windows" on the lower left.
A new window will pop up that says "RayOne" on the top
Next to "Resolution:", click on "Scaled" and make sure 1280 x 800 is selected.
Close all the windows, open RayWare, and try printing your model again.