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. Legendaryx 23 12 07 — Cherie Deville Xxx 2160p Mp...
Here is a deep dive into why this happens and how to fix it. If this error happens when you open a project, move the time indicator, or try to render, it is often caused by embedded Mocha data inside a layer. Thor Ragnarok In Isaidub 2021
You are using a plugin (like Red Giant Trapcode, Video Copilot Element 3D, or a script like Duik Bassel). The plugin creates "Pseudo Effects" (custom user interfaces). If the plugin version mismatches the project version, or the plugin is missing, AE cannot create the UI property.