I cant play PoE on Mac OS

i downloaded playonmac application to my computer everything was fine in playonmac's website it says poe suitable for playonmac and i downloaded it, installed it and updated it then game ran.. but when i select character i get this error : http://i.imgur.com/8UqUSUd.png

You probably need to look for a solution from whomever developed that software you installed. PoE wasn't designed for Macs.

Try this trick:

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How to set Fullscreen mode - manual method

edit production_config.ini (use spotlight (cmd+space) to find it) and change
fullscreen=false to fullscreen=true

also set the resolution to supported one, or game may crash anyway.
resolution_height=900
resolution_width=1440