After Effects Error Asked To Create Unknown Property Of Type Fix [portable] ⟶ [Complete]

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.

it does not recognize, often due to a mismatch between software versions, missing plugins, or conflicting font/layer names Immediate Fixes Update Legacy Expressions: File > Scripts > Update Legacy Expressions

Ensure any third-party plugins (like Boris FX or Mt. Mograph) used in the project are installed and up-to-date. Rename Problematic Items: Avoid using system-reserved words like "Menu Type" You applied a Mocha Pro plugin (or used

Check installed third‑party plugins

: Corrupted preference files can cause unexpected property errors. Reset them by holding Ctrl+Alt+Shift (Windows) or Command+Option+Shift (macOS) while launching After Effects. Mograph) used in the project are installed and up-to-date

: Legacies variations in JavaScript. Templates built years ago use legacy ExtendScript syntax, while modern versions of After Effects use a standardized JavaScript architecture.

Did this error trigger while , launching the app , or running a custom script ? What version of After Effects are you currently running? : Legacies variations in JavaScript

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.

If the error message includes a specific keyword after "type" (e.g., "type Pseudo/Effect Name"), it points directly to a plugin.

Check the "Effects" panel for any entries labeled "Missing."