After Effects Error Asked To Create Unknown Property Of Type Fix (Premium – WORKFLOW)

If you’ve been working on a complex composition in Adobe After Effects, specifically using expressions or scripts, and suddenly encountered the error: , you are not alone. This is a common, frustrating error that often stops rendering or previewing in its tracks.

If you are working with a Motion Graphics template (.mogrt) from Envato or Adobe Stock:

Corrupted local memory data often blocks the software from parsing standard properties. If you’ve been working on a complex composition

When this box pops up, your RAM preview stops, your render fails, and your heart sinks. What on earth is a "FIX" property?

: /Applications/Adobe After Effects (version)/Scripts/ScriptUI Panels When this box pops up, your RAM preview

If you are writing custom tools and encountering this error (e.g., asked to create unknown property of type "ADBE Vector Graphic" ), your script is requesting an invalid internal property string.

Don’t let a cryptic error message ruin your render. Here is exactly what that “FIX” error means and how to solve it. Don’t let a cryptic error message ruin your render

The specific property mentioned in the error gives clues. You might see "adbe layer source alternate (1d16)" or "Pseudo/0.05992381499487505-0003" , often linked to third-party effects or presets.

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 the problem stems from a downloaded project template, updating how scripts handle animations within your timeline often clears the error instantly. Go to the menu at the top of the program. Select Scripts > Update Legacy Expressions.jsx .