A plugin (like Red Giant Trapcode Particular, Element 3D, or Boris FX) creates custom property types. If the plugin is missing, outdated, or not installed correctly, After Effects will throw this error when it tries to render or reference that property.
If the project was transferred via a faulty drive, cloud sync error (e.g., Dropbox/Google Drive conflict), or incomplete download, the property header data may be mangled. after effects error asked to create unknown property of type
: Some advanced presets use "pseudo-effects" (custom control sliders) that must be manually installed or generated by another tool before the preset will work. How to Fix "Unknown Property of Type" A plugin (like Red Giant Trapcode Particular, Element
: Temporarily move scripts from your Scripts/ScriptUI Panels folder to another location, then restart After Effects to see if the error persists. : Some advanced presets use "pseudo-effects" (custom control
Close After Effects, navigate to your scripts folder, and temporarily move your scripts to another directory. Re-insert them one by one to identify if a specific script is the culprit.
If you are facing this error, try the following steps in order: