The "After Effects error: asked to create unknown property of type" is a common but frustrating warning that typically indicates a mismatch between the software and the project's scripts, expressions, or plugins. This error often occurs when After Effects encounters a "pseudo-effect" or a custom property it doesn't recognize Common Causes Outdated Expressions
Re-open Script/Extension Panels: If you use tools like Motion 4 or Duik, right-click their panel title to "Close Panel," then reopen them via Window > Extensions .
If you’ve been working in Adobe After Effects long enough, you’ve probably seen a few head-scratching error codes. But the one that has been popping up more frequently lately—especially for users working with expressions, templates, or specific third-party scripts—is:
If you are a professional motion designer, consider this error a reminder to implement rigorous version control and regular XML-based saves. Adobe has improved error handling in recent releases, but robust habits remain your best defense.
This error often triggers when you open a project or apply a preset that requires a third-party plugin you don't have installed (e.g., Red Giant Universe Boris FX Continuum Update Legacy Expressions:
This is a data mismatch or corruption error. It typically occurs in three scenarios:
"asked to create unknown property of type" error in After Effects typically occurs when the software tries to access a feature, effect, or script parameter that it doesn't recognize. This usually points to a missing plugin, an outdated expression, or a conflicting script. Common Fixes Install Missing Plugins:
If this error happens when you open a project, move the time indicator, or try to render, it is often caused by embedded Mocha data inside a layer.
The "After Effects error: asked to create unknown property of type" is a common but frustrating warning that typically indicates a mismatch between the software and the project's scripts, expressions, or plugins. This error often occurs when After Effects encounters a "pseudo-effect" or a custom property it doesn't recognize Common Causes Outdated Expressions
Re-open Script/Extension Panels: If you use tools like Motion 4 or Duik, right-click their panel title to "Close Panel," then reopen them via Window > Extensions .
If you’ve been working in Adobe After Effects long enough, you’ve probably seen a few head-scratching error codes. But the one that has been popping up more frequently lately—especially for users working with expressions, templates, or specific third-party scripts—is: The "After Effects error: asked to create unknown
If you are a professional motion designer, consider this error a reminder to implement rigorous version control and regular XML-based saves. Adobe has improved error handling in recent releases, but robust habits remain your best defense.
This error often triggers when you open a project or apply a preset that requires a third-party plugin you don't have installed (e.g., Red Giant Universe Boris FX Continuum Update Legacy Expressions: Restart After Effects – temporary glitches can cause this
This is a data mismatch or corruption error. It typically occurs in three scenarios:
"asked to create unknown property of type" error in After Effects typically occurs when the software tries to access a feature, effect, or script parameter that it doesn't recognize. This usually points to a missing plugin, an outdated expression, or a conflicting script. Common Fixes Install Missing Plugins: Re-open Script/Extension Panels : If you use tools
If this error happens when you open a project, move the time indicator, or try to render, it is often caused by embedded Mocha data inside a layer.