After Effects Error Asked To Create Unknown Property Of Type Fix (2024)

If the project uses expressions from older versions of After Effects, the engine may struggle to read them. Go to File > Scripts > Update Legacy Expressions.jsx to automatically update them to the modern engine. Remove Conflicting Scripts:

: Projects or templates created in older versions of After Effects may use expressions that the modern JavaScript engine cannot interpret. Missing or Outdated Plugins : If a project uses third-party tools like Boris FX Continuum Red Giant Universe If the project uses expressions from older versions