: Close After Effects. Hold down Ctrl + Alt + Shift (Windows) or Cmd + Option + Shift (Mac) while launching the software again. Click Yes to delete your existing preferences file. 🔍 Understanding the Root Causes Error Variable / Trigger Main Reason Common Solution
Let After Effects automatically parse and rewrite the outdated code structure.
: System font conflicts that prevent After Effects from rendering typography parameters correctly. Step-by-Step Fixes for "Asked to Create Unknown Property"
Cut and paste all files inside this directory into a temporary backup folder on your desktop.
Click "Yes" when asked if you want to delete the preferences file. Step 5: The "New Project" Import Trick : Close After Effects
Restart After Effects. If the error is gone, move the scripts back one by one to identify the culprit. 4. Re-install/Update the Template/Preset
If you've recently installed or updated a plug-in, try disabling it or removing it temporarily to see if that solves the issue.
After Effects will treat the old project structure as an asset folder, allowing you to salvage your individual compositions without activating the bugged sequence on startup. Diagnostic Check Checklist asked to create unknown property of type - Adobe Community
if (effect("Gaussian Blur")("Blurriness").numKeys > 0) // do something else value; // Default to current value Use code with caution. Conclusion 🔍 Understanding the Root Causes Error Variable /
Remove or replace the bad property
Navigate to the top menu bar and select .
FAQ: How to fix "Unknown BIB Error" in After Effects | Community
: Legacies variations in JavaScript. Templates built years ago use legacy ExtendScript syntax, while modern versions of After Effects use a standardized JavaScript architecture. Click "Yes" when asked if you want to
A script UI panel loading on startup is faulty. 5 Ways to Fix "Asked to Create Unknown Property of Type"
To reset preferences: Hold down Ctrl+Alt+Shift (Windows) or Cmd+Option+Shift (macOS) while starting After Effects. Summary Checklist Potential Cause File -> Dependencies -> Update Legacy Expressions Startup Error Move scripts from ScriptUI Panels folder Template Error Re-install third-party .jsx scripts Cannot Open File Import broken project into a new one
Corrupted local memory data often blocks the software from parsing standard properties.
Now that we've covered the causes of the error, let's dive into the solutions: