| Step | Action |
|------|--------|
| Reset Preferences | Hold Ctrl+Alt+Shift (Win) or Cmd+Option+Shift (Mac) while launching AE → click “Delete Preferences” |
| Clear cache & database | Edit > Purge > All Memory & Disk Cache |
| Disable “Allow Scripts to Write Files” | Edit > Preferences > Scripting & Expressions → uncheck the option, restart AE |
| Run Adobe Cleaner Tool (if error persists across reinstalls) | Download from Adobe – removes corrupted extensions/scripts |
In simple terms, After Effects is trying to read a piece of data (a property of an object, like a color, slider, or position) but doesn’t recognize the format it's being given. | Step | Action | |------|--------| | Reset
The term FIX is internal jargon—it likely refers to a fixed-point number or an old, deprecated data type that newer versions of After Effects no longer support natively. You are essentially asking the software to build something using a blueprint it no longer understands. In simple terms, After Effects is trying to
This error is almost never caused by a bug in After Effects itself. It is almost always caused by: Note: If the error message includes a specific
If the error is locked to a specific project file:
Note: 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.