After Effects Error Asked To Create Unknown Property Of Type Fix

If the project crashes immediately upon opening due to this error, use the : Launch Adobe After Effects with a fresh, empty composition.

Happy animating, and may your previews be green. If the project crashes immediately upon opening due

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| | Most Likely Cause | Fastest Fix | | :--- | :--- | :--- | | Error when opening a project with a third-party preset or template | Pseudo-effect or missing effect | Re-read the preset's documentation; manually create missing effect layers. | | Error when opening a project that uses scripts or expressions | Outdated scripts or expressions | Run File > Scripts > Update Legacy Expressions ; update third-party scripts. | | Error on launch before any project opens | Corrupted third-party script panel | Remove or temporarily disable scripts from the ScriptUI Panels folder. | | Error with an expression in a specific layer | Data type or reference issue | Use try...catch statements; double-check variable/attribute names. | Try again later