after effect error: file is damaged (33:7)

Mylenium, your boilerplate criticisms are not helpful.

Error 33:7 indicates that the project file (.AEP) is corrupted, which can happen for a variety of reasons (computer being forced to shut down while After Effects is still active, a cache fault on the hard drive, even a virus). If importing the AEP file into a new project doesn't work, then unfortunately there is very little you can do. The 'import to new' workaround is pretty much the last resort option. AEP files are not editable in any other applications, so if After Effects will not progress beyond the corruption then there's no way to manually copy out the data. It suggests that the file is badly mangled. The source materials for your project won't be affected, but of course the work dine inside the compositions is lost.

When you say that auto-save is not working, do you mean that the backup AEP files have been created but cannot be opened, or that they were never created in the first place? If you have auto-save enabled and the files are still not being created, then it suggests a bigger problem with your system (if a manually-chosen location for auto-saves is unavailable, AE will create a default folder below the AEP file location).

Obviously in hindsight, having a system-level backup policy (e.g. making nightly copies of your files onto an external disk) would have probably saved you some re-working, but hindsight is a wonderful thing. After Effects own auto-backup is more of an emergency "I didn't mean to do that" tool, for example if you delete a comp and accidentally hit ctrl-S instead of ctrl-A.