This error in Adobe After Effects usually appears when a script or expression tries to modify or read a property that After Effects doesn’t recognize (often due to version mismatches, corrupted workspaces, or third‑party scripts expecting a different object structure).
The "Asked to Create Unknown Property" error is a common headache for Adobe After Effects users. It usually pops up when the software encounters data it doesn't recognize within a project file. This often happens when moving projects between different versions of After Effects or when using third party plugins. If you are stuck with this error, here is how to resolve it. Understand the Cause This error in Adobe After Effects usually appears
The Scenario: You applied a Mocha Pro plugin (or used the built-in Mocha tracking workflow) and the data embedded in the layer has become corrupt. AE tries to read the tracking data property but fails to identify what type of data it is. Go to Edit > Preferences > General
If you are a motion designer, video editor, or visual effects artist, you have likely encountered the dreaded cryptic red warning box in Adobe After Effects. Among the most frustrating and confusing of these is the error: The Scenario: You applied a Mocha Pro plugin
Solutions to fix the "Asked to create unknown property of type" error