After Effects Error Asked To Create Unknown Property Of Type Fix

When you encounter the "After Effects error asked to create unknown property of type" error, you may see one of the following symptoms:

Go to Edit > Purge > All Memory & Disk Cache . Sometimes, cached data can cause phantom property errors. Restart After Effects: Never underestimate a quick restart. 3. Fixing Expression-Based Errors

This is a . It typically occurs in three scenarios:

and temporarily move the contents elsewhere. Corrupted variations of plugins can trigger this dialogue. Fix Font Conflicts: Unsync and resync Adobe Fonts

: Verify that all required plugins for your project (e.g., Boris FX Continuum , Red Giant Universe , or Sapphire ) are correctly installed and updated. If a project was created on a machine with a plugin you don't have, After Effects may throw this error. Project Troubleshooting asked to create unknown property of type - Adobe Community When you encounter the "After Effects error asked

: Hardcoded control names inside templates (like naming a custom slider "Layer" or "Menu Type") that conflict directly with native After Effects code parameters.

in custom pseudo-effects or Master Properties, as these can cause structural conflicts. Advanced Troubleshooting Isolate the Culprit:

Ensure your plug-ins match your current version of After Effects.

Post your exact workflow and the contents of the AE Console (Window > Console) to the Adobe Community forums or r/AfterEffects. Include which plugins and fonts your project uses. Avoid sharing the AEP file publicly unless stripped of client data. Corrupted variations of plugins can trigger this dialogue

Prevention beats cure. Adopt these habits to never see "asked to create unknown property of type 'fix'" again.

This error typically occurs when After Effects encounters a pseudo-effect (custom effect controls) or a Master Property

This error is almost always triggered by a structural breakdown between After Effects and data structures nested inside your project file. The core culprits include:

If the error message includes a specific property name (e.g., "unknown property of type 'Mask Feather'"), use that clue to inspect your project for that specific property. Deleting and re-creating that specific property (e.g., removing a mask and drawing a new one) often resolves the issue immediately. let me know:

This forces After Effects to rebuild the project architecture, frequently stripping away the broken data block that caused the property error. 2. Isolate and Purge Corrupted User Presets

When the error first appears, . This often worsens the corruption. Instead, follow this emergency protocol:

: A dedicated "Safe Open" that strips all non-native effects to allow project recovery without crashing. If you'd like to try a specific fix, let me know: