After Effects Error Asked To Create Unknown Property Of Type Fix ★ Genuine & Confirmed

: If you are using an older project template, the expressions may be outdated. Go to File > Scripts > Update Legacy Expressions.jsx to automatically update them for newer versions of After Effects.

Use in a copy of your project:

Remember: every seasoned AE user has faced the "fix" error. It is a rite of passage. Fix it once, and you will never be slowed down by it again. : If you are using an older project

Try removing all scripts and re-adding them one by one to find the culprit. : If you are using an older project