Work in Adobe Illustrator CS6

Hello guys. Help solve the problem. Work with Adobe Illustrator CS6, I am a designer in one big company. Every week I do the project, and the last one, at the opening gave the following message - an unknown error has occurred. Worked with this file as usual, kept, as it should be – I do not understand why this happened? I've been digging around the Internet in search of solution but all what I found did not help me. The file still doesn't open. Can anyone here know how can you recover a adobe illustrator file?