Given that plugins cause ~55% of "fix" errors, this method succeeds for most users.
The "asked to create unknown property of type" error in Adobe After Effects typically occurs when the software encounters a missing plugin, an incompatible preset, or a bugged script that references a property After Effects doesn't recognize Common Causes Missing Third-Party Plugins: Given that plugins cause ~55% of "fix" errors,
Did this happen a new plugin or script?
If AE opens correctly, add your scripts back one by one until the error reappears to find the "troublemaker". 2. Refresh Extensions (For Motion v4 & Similar) 4. The "Clean Import" Method
To resolve this error, try the following solutions: an incompatible preset
Go to File > Scripts > Update Legacy Expressions.jsx . This built-in Adobe script updates older expression syntax to be compatible with the newer JavaScript engine. 4. The "Clean Import" Method