Go to (or press Ctrl + I on Windows, Cmd + I on Mac). Select your corrupted .aep project file and click Import .
A script created for an older (or much newer) version of AE is attempting to access properties that have changed. 2. Immediate Solutions & Fixes
The error frequently involves "pseudo-effects," which are custom controls created by developers. If After Effects cannot find the definition for these custom properties, it triggers the warning.
An expression references an effect (e.g., effect("Gaussian Blur") ) that was deleted or renamed. Go to (or press Ctrl + I on Windows, Cmd + I on Mac)
: If you are creating or using custom pseudo-effects, ensure none of the items use names that conflict with After Effects' internal structure (e.g., avoid naming a parameter "Layer").
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.
Using older project files or templates with expressions built for older versions of the After Effects Javascript engine. Essential Graphics/Master Properties: An expression references an effect (e
Since faulty or incompatible scripts are a prime suspect, it's time to investigate.
If you are referencing Slider Controls, ensure the Slider Control actually exists on the controller layer. 4. Fixing Script-Based Errors
Let After Effects scan your timeline and automatically translate old syntax rules to the modern JavaScript engine. Check the source (Aescripts
Check the source (Aescripts, VideoHive, etc.) for an updated version.
This happens when you open a downloaded project template containing a specialized effect—such as Maxon Red Giant suites—that is absent from your local drive.