After Effects Error Asked To Create Unknown Property Of Type Fix | Real | 2025 |

When custom tools build shape layers or effect structures programmatically, using an outdated ADBE match name will trigger this exact error dialog. Step-by-Step Fixes for the After Effects Error 1. Update Legacy Expressions

: C:\Program Files\Adobe\Adobe After Effects (version)\Support Files\Scripts\ScriptUI Panels .

Navigate to your scripts folder and move everything to a temporary folder on your desktop. Restart After Effects to see if the error persists.

How to Fix the "After Effects error: asked to create unknown property of type" Bug When custom tools build shape layers or effect

: C:\Program Files\Adobe\Adobe After Effects (version)\Support Files\Scripts\ScriptUI Panels

The After Effects error message "" typically indicates a conflict between the software and a specific script, third-party plugin, or a corrupted project property. This error often prevents users from opening a project entirely or pops up repeatedly during startup. Common Causes of the Error

: If Safe Mode resolves the error, navigate to your startup script folders to find the culprit: Navigate to your scripts folder and move everything

The "After Effects asked to create unknown property of type" error typically occurs when a script or plugin tries to access a property that doesn't exist or isn't compatible with your current version of After Effects . Understanding the Error

If the error appears only when applying a specific animation preset, the preset itself might be looking for an effect you don't have.

If isolating scripts doesn't work, the issue may be related to the or internal preferences: This error often prevents users from opening a

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

[Hold Shortcut Keys] ---> [Launch After Effects] ---> [Confirm Reset Dialog] Hard Preference Reset Quit the application.

In some cases, switching the engine back to the older version helps. Go to File > Project Settings > Expressions and change the engine to Legacy ExtendScript Restart Extensions: If you are using extensions like Mt. Mograph Motion

A much less common but possible cause is a naming conflict. If you have a custom effect or pseudo-effect where an internal item is named "Layer," After Effects might confuse it with its own native "Layer" structure. The system gets confused trying to reconcile your custom property with its own built-in objects.

This table provides a quick reference, but for a complete understanding and step-by-step solutions, continue reading the full article.