What version did you have before you had CC 2017? (There was no such thing as CC 2016 released to the public.)
What hardware do you have?
I have not seen a response from you since your original post. Do you still need help? If so let us know. If not, please tell us how you solved your issue if you don't mind.
I still need help with this like i saved it and all
The next morning
After Effects missing data in file (33:4)
I'm so so so mad because i've been working on this for 2 weeks and i always save whenever i'm done
Can you import that file into a new AE project?
Can you open any of your auto-save files?
Do you do incremental saving? If so, can you open any of them? If you don't do incremental saving, I highly recommend you start. AE even has a very handy, built-in command for increment and save. I usually invoke it every time I start doing something major in a project. So, usually a couple times a day, if not more.