After Effects Error Asked To Create Unknown Property Of Type Fix 🎁 ⏰

: Internal configuration files can sometimes become corrupted, leading to "unknown exception" warnings. How to Fix the Error 1. Update Legacy Expressions

: Missing or un-updated third-party plug-ins like Magic Bullet Looks or Video Copilot's Saber. If the project file itself is slightly corrupted,

If the project file itself is slightly corrupted, you can often bypass the error by importing it into a fresh workspace rather than opening it directly. Open After Effects and create a brand new project. Go to File > Import > File. Select the problematic .aep file. Select the problematic

The most frequent cause is trying to open a project file in an older version of After Effects than the one it was saved in. While After Effects is generally backwards compatible, it is not always forwards compatible. The Solution Ensure your Creative Cloud app is fully updated. it is not always forwards compatible.

Relaunch After Effects. If it opens cleanly, paste the items back to pinpoint the problematic tool.

Relaunch After Effects. If the error is gone, one of those scripts was the "troublemaker".

1. The Clean Project Import Method (Best for Unopenable Files)