Unity hold up on when opening a project

Hi All,

I started an android project 2 months ago. I have 2 small scene and light map of approximately 8 mb. It all works fine till one day in build setting I changed compression type to etc (since I read that it is proffered compression type for android) and ever since when I want to re open the project (when starting Unity) to work on it it just holds.I see a little green bar that says it load the exr file but it takes for ever!! I waited an hour and nothing happened. I must say that other I can open without any problem.

I'll appreciate you help since I cannot continue work on my project...

Thank u in advance