Older templates often reference internal data types or script properties that Adobe removed or changed in modern JavaScript engine updates.
Because this error is triggered by different underlying causes, there is no single "fix." Instead, you have to systematically rule out the common culprits.
Go to , or press Ctrl + I ( Cmd + I on Mac).
One of the most frequent culprits behind this error is a conflict or incompatibility introduced by third-party scripts, extensions, or UI panels. Older templates often reference internal data types or
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
To resolve this error, try the following solutions:
Working in Adobe After Effects can be a smooth experience, but occasionally you’ll encounter cryptic errors that halt your creative flow. One of the most frustrating, particularly when dealing with complex projects or templates, is: One of the most frequent culprits behind this
Older projects using expressions may clash with the modern JavaScript engine.
| 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). |
Restart After Effects. If the error is gone, move the scripts back one by one to identify the culprit. 4. Re-install/Update the Template/Preset One of the most frustrating, particularly when dealing
If the error occurs while animating, it’s usually an expression. Scenario A: Missing Effect/Layer
To check all expressions at once: Edit > Find → Search for toFixed( → Check the box .
If the project structure itself is corrupted and prevents you from even viewing your workspace, you can often bypass the broken property reference via importing: