Help my after effects file won´t open

Hi... I was working on an after effects file and it suddenly crashed and an error came out and it said that a copy was made. So I opened the copy and the same thing happens as soon as I open it, I don´t know what to do, I already restarted my computer, I installed and uninstalled after effects and nothing works. This is a really important file and I can´t lose it. Please help!!