Nobody can tell you anything without proper system info or other technical details, including version of AE, details about your AI files and so on. Just saying that it doesn't work is not useful at all.
I haven't had issues like you describe. As Mylenium says, we can't really help much without more information. What version of Illustrator and AE are you using? Try using older versions and see if they behave differently: How to Find and Install Previous Version of Adobe Apps in CC 2015
thank you for your reply.
after a lot of search and tests, I found out that the problem was with specific file that include some embed photos and make the AI files too heavy to open.
I delete those photo and After Effects works Properly!
thanks for your goodwill.
No problem. Thank you for sharing what worked!