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After Effects Error Asked: To Create Unknown Property Of Type Fix

Try these solutions in order. Chances are, Step 1 or 2 will save your day.

Fix This Fast: Resolving “Asked to Create Unknown Property of Type FIX” in After Effects

Did this happen a new plugin or script?

: Presets or plugins (like Magic Bullet Looks) often build hidden "pseudo-effects" into custom layers. If the plugin is missing or updated to a version with different parameters, After Effects fails to generate that hidden slider or property control.

If you are running a complex script (like DuIK, Limber, or Plexus) when the error appears: Try these solutions in order

To help you find a more specific solution, could you tell me:

Alt-Click (Windows) or Option-Click (Mac) the stopwatch icon to disable the expression. 5. Update or Re-path Expressions

To fix the , you must address outdated expressions, missing third-party plugins, broken ScriptUI panels, or script syntax mismatches. This error typically occurs when a project file, preset, or script tells Adobe After Effects to look for a core property, custom parameter, or "pseudo-effect" that does not exist in your current version of the software.

This error is almost always tied to or naming conflicts within expressions, Mogrt templates, third-party plug-ins, or custom scripting structures. The most common culprits include: : Presets or plugins (like Magic Bullet Looks)

If updating your expressions does not work, try forcing After Effects to read the code using its older architecture:

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.

Sounds like you hit the After Effects error: "Asked to create unknown property of type 'Fix'" (or similar). That usually happens when a project references a plugin, effect, or expression that AE can't recognize. Steps to diagnose and fix:

Follow these troubleshooting steps in order to resolve the issue. 1. Identify the Broken Expression Before fixing it, you need to find it. Click OK on the error box. you must address outdated expressions

Right-click the extension panel title and select Close Panel . Then, navigate to Window > Extensions > Motion 4 to reopen it. This forced reboot often clears the error immediately. 3. Update Legacy Expressions

: Documents\Adobe\After Effects [Version]\User Presets\ Mac : Documents/Adobe/After Effects [Version]/User Presets/

FAQ: How to fix "Unknown BIB Error" in After Effects | Community