Unable to build iOS project

I am new to unity. I am unable to build and run project for iOS platform, when I try Unity becomes either 'not responding' or simply crashes leaving a bug reporting screen below.

I have installed Unity version 3.5.6f4 on OSX 10.11.2. Is there any other dependency to build project on iOS platform. Have any one came across the same issue?. Any help appreciated. Thanks in advance. Below are my machine specification

Unity version 3.5.6f4 OSX Version : 10.11.2 RAM : 8 GB