How to Fix the "After Effects error: asked to create unknown property of type" Bug
This error typically occurs when After Effects encounters a pseudo-effect (custom effect controls) or a Master Property
: If a property is "unknown," a UI window would allow the user to manually map that legacy property to a new or existing one, rather than just throwing an error and resetting the project. How to Fix the "After Effects error: asked
After Effects Error: Asked to Create Unknown Property of Type [FIX]
it does not recognize, often due to a mismatch between software versions, missing plugins, or conflicting font/layer names Immediate Fixes Update Legacy Expressions: File > Scripts > Update Legacy Expressions This forces After Effects to rebuild the project
Does it happen on or when you try to open a specific project ? What version of After Effects are you currently running?
This forces After Effects to rebuild the project architecture, frequently stripping away the broken data block that caused the property error. 2. Isolate and Purge Corrupted User Presets Delete the effect and run the script again
Sometimes, a script-generated effect gets corrupted. Delete the effect and run the script again. 5. Preventive Measures
: Temporarily move scripts out of your ScriptUI Panels folder to see if the error persists. You can find this folder in the Adobe After Effects installation directory under Support Files/Scripts/ScriptUI Panels . Rename Conflicting Pseudo-Properties
If the error explicitly references a missing effect or third-party plug-in framework (such as Red Giant or Boris FX Continuum), the data fields cannot map correctly.