After Effects Error Asked To Create Unknown Property Of Type Fix Here

if (effect("Gaussian Blur")("Blurriness").numKeys > 0) // do something else value; // Default to current value Use code with caution. Conclusion

: In rare cases, "Unknown Exception" errors are caused by missing or corrupt fonts that the script is trying to load for its UI.

Move all items out of this folder to a temporary desktop directory. Re-introduce them one by one, restarting After Effects between each until the crash or loop triggers again. 2. Update or Change the Expressions Engine if (effect("Gaussian Blur")("Blurriness")

If you’ve been working on a complex composition in Adobe After Effects, specifically using expressions or scripts, and suddenly encountered the error: , you are not alone. This is a common, frustrating error that often stops rendering or previewing in its tracks.

: Modern versions of After Effects use a fast JavaScript engine, which can fail when reading mathematical or conditional data from legacy templates. Re-introduce them one by one, restarting After Effects

: If you use extensions like Mt. Mograph Motion v4, the error may stem from a failed initial boot of that panel. : Close the extension panel (right-click the title and hit Close Panel ) and then reopen it via Window > Extensions Script UI Conflicts

Sometimes, the problem isn't with your project at all, but with After Effects itself. Corrupted workspace or preference files can cause all sorts of strange behavior, including errors when reading property types. This is a common, frustrating error that often

Code is trying to apply a 2D position property to a 3D layer, or vice versa, causing a type mismatch.