Whta project? You need to be more specific. Start by enabling capslock when openening the file to suppress rendering, then check for potentially critical settings, effects, fonts and so on.
I Bought a template online (https://videohive.net/item/text-animator-01-creative-modern-titles/16491525 ), it was originally working. Then I installed a font from dafont.com "Sansation" that when the project would not open. I re-downloaded the project still getting the same errors as above. When I have cap locks on it still gets the same errors. When I don't open the project file and open AE Regular it will work fine.
If you uninstall Sansation, does it work?
Did you ever get your project completed? What went wrong with the template? Was it a bad font? Let us know.