after effects zero denominator converting ratio denominators/won't render project

[idkw17348735]

i keep getting this message that won't let me render my projects all the way through. i have never gotten it in my entire time using this program (adobe cc 2019) and i don't know what to do. i worked for hours on this project and don't want to lose it. i tried adjusting the frames, but i still get that message. i've given all the information i know, because like i said, this is the first time this error has happened. it wouldn't matter if i could render all my video.

[Roland Kahlenberg]

You need to provide specifics.

1) Any third party effects?

2) Any built-in effects?

3) Does the render abort with an error message? If yes, what is the message?

4) When the render aborts, what happens to AE? Does AE exit automatically?

5) Does the render abort at the same point in time, in the Timeline?