After Effects Error Asked To Create Unknown Property Of Type Fix Jun 2026

Use in a copy of your project:

| Prevention Tactic | Why It Works | |------------------|---------------| | | XML files are human-readable and recoverable. Go to Preferences > Files and enable "Allow script to write files and network." | | Use an Auto-Save interval of 10 minutes | Limits data loss. Set via Edit > Preferences > Auto-Save . | | Avoid nested effects from different vendors | Mixing Boris FX with Red Giant on the same layer increases property type conflicts. | | Collapse transformations sparingly | The "fix" error often triggers when a pre-comp with collapse transformations contains a 3D layer with a corrupt effect. | | Update plugins before updating AE | Always update Trapcode, Sapphire, and Element 3D before upgrading your AE version. | | Run the Built-in Project Fixer | Go to File > Scripts > Project Fixer (after installing the free script from Adobe Community). |

: Older project templates may rely on legacy JavaScript syntax that native modern layout rules do not recognize. Use in a copy of your project: |

The most frequent cause is trying to open a project file in an older version of After Effects than the one it was saved in. While After Effects is generally backwards compatible, it is not always forwards compatible. The Solution Ensure your Creative Cloud app is fully updated.

Before diving into the detailed fixes, use this guide to identify the most likely cause of your error: | | Avoid nested effects from different vendors

If you can't find it, press EE on your keyboard to reveal all expressions in the composition. 2. The "Pre-compose" Solution

to bring your old project into it. This can sometimes bypass project-level corruption. Change Expression Engine File > Project Settings > Expressions , try switching the "Expressions Engine" to Legacy ExtendScript Error: asked to created unknown property of type "x" (1d16) | | Run the Built-in Project Fixer |

Use the Creative Cloud Desktop App or designated third-party managers to repair plug-in installations.

To prevent this in the future, a "Property Resolver" feature could be proposed to Adobe: