Getting this message when attempting to save (or save as) my project:
After Effects warning: error with file:
So, I considered the possibility of a corrupt project, but I cannot save any of my projects. I considered the issues of permissions on my data drive. That's not it. I tried to import the project into a new project. No dice.
Just tried saving to my C: drive, and it worked. Then tried again saving to my data drive, and it worked. Well, just tried saving the project that was having the problem and it worked. Whatever it was, it seems to be working now.