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

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:

When this box pops up, your RAM preview stops, your render fails, and your heart sinks. What on earth is a "FIX" property? Sounds like you hit the After Effects error:

1. Duplicate the project.
2. Delete half the compositions → test.
3. Repeat until you find the comp/layer causing the error.
4. Inside that comp, disable effects/expressions one by one.
5. Likely find: a script‑created control (checkbox/slider) with an internal name “FIX”.

• If you have the Essential Graphics panel open, close it before opening the project.
• If you can open the project, go to the Essential Graphics panel and click "Push Changes" or remove any properties listed there that might be broken.

: Ensure all required plugins are installed and updated. If the preset came with a tutorial or documentation, double-check for "pseudo-effects" you were supposed to install first. Outdated Expressions Duplicate the project

Inspect expressions and JSON/Essential Graphics If you have the Essential Graphics panel open,

After Effects Error: "Asked to create unknown property of type 'fix'" – Full Fix Guide

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:

Third-Party Recovery Tools

• AEP File Recovery Tool (by AEScripts) – $49, but recovers layers, keyframes, and effects from corrupted files.
• AE Project Salvage – Free script that extracts comps one by one.