How to Fix the After Effects Error: "Asked to Create Unknown Property of Type"
Check project/asset compatibility
If the file is corrupted at the structural level (XML data corruption), you need to strip the metadata.
If the error occurs right after loading an older motion graphics template, After Effects is likely failing to translate outdated expression properties. Go to the top menu and select . Scroll down to Scripts > Update Legacy Expressions.jsx .
: If you use tools like Motion 4 or Duik , right-click their panel title to "Close Panel," then reopen them via Window > Extensions . How to Fix the After Effects Error: "Asked
This is especially common in After Effects Beta versions, where, as noted by the After Effects Engineering Team, deleting the ModifiedWorkspaces and OriginalUserWorkspaces folders in the preferences can resolve the issue.
If you're still having trouble, providing more details about your error message and the steps leading up to it could help narrow down a more specific solution.
Cut all files from this folder and paste them temporarily into a backup folder on your desktop.
C:\Program Files\Adobe\Adobe After Effects (Your Version)\Support Files\Scripts\ScriptUI Panels Scroll down to Scripts > Update Legacy Expressions
Launch After Effects and create a completely .
Rename pseudo-element items to avoid naming conflicts with AE defaults. asked to create unknown property of type - Adobe Community
If the error occurs immediately upon loading an old project file or template, it is likely caused by outdated expression components. You can automate the repair using native tools:
This error typically occurs when After Effects encounters a pseudo-effect (custom effect controls) or a Master Property If you're still having trouble, providing more details
Post your exact workflow and the contents of the AE Console (Window > Console) to the Adobe Community forums or r/AfterEffects. Include which plugins and fonts your project uses. Avoid sharing the AEP file publicly unless stripped of client data.
If this error appears immediately after running a script (like a motion graphics toolkit or a rigging tool):
If you are working in Adobe After Effects and encounter the error message you are not alone. This frustrating error usually pops up when After Effects attempts to interpret complex expression-driven data, often relating to shape layers, text animators, or third-party scripts.
C:\Program Files\Adobe\Adobe After Effects (version)\Support Files\Scripts\ScriptUI Panels .