A project created in CC 2024 might use an expression syntax that doesn't exist in CC 2023.
If you have expressions, try not to rename layers after the expression is written.
The error message "Asked to create unknown property of type" typically occurs when After Effects is unable to recognize a property or attribute that you're trying to access or modify. This can happen due to various reasons, such as:
You have an expression (the little pick-whip code) linking one property to another. Sometimes, if the source property is deleted or renamed, the expression tries to "create" a link to a property that no longer exists, confusing AE. A project created in CC 2024 might use
: A script running at startup might be the "troublemaker".
The suffix of the error code often points directly to a missing parameter string (e.g., pointing to terms like "Pseudo" or "Red Giant").
If the project crashes immediately upon opening due to this error, use the : Launch Adobe After Effects with a fresh, empty composition. This can happen due to various reasons, such
The "After Effects error asked to create unknown property of type" error is a common issue that occurs in Adobe After Effects, a popular digital visual effects, motion graphics, and compositing software. This error typically arises when you're trying to access or modify a property that doesn't exist or is not recognized by the software.
: You are missing a plugin or script that creates custom UI controls. Install the specific plugin required by that project file.
If the error prevents you from opening your .aep file, you can often bypass the corrupted property check during startup by importing the file as footage. Launch and create a completely blank project. The suffix of the error code often points
This is a . It typically occurs in three scenarios:
/Applications/Adobe After Effects (version)/Scripts/ScriptUI Panels .