The "Asked to Create Unknown Property" error is a common headache for Adobe After Effects users. It usually pops up when the software encounters data it doesn't recognize within a project file. This often happens when moving projects between different versions of After Effects or when using third party plugins. If you are stuck with this error, here is how to resolve it. Understand the Cause
Check the "Effects" panel for any entries labeled "Missing." The "Asked to Create Unknown Property" error is
Click "Yes" when asked if you want to delete the preferences file. Step 5: The "New Project" Import Trick If you are stuck with this error, here is how to resolve it
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. While After Effects is generally backwards compatible, it
Opening a project created in a newer version of After Effects. Missing plugins that were used in the original project. Corrupt preference files or cache data. Expression errors that reference non-existent effects. Step 1: Check for Version Compatibility
Sometimes, After Effects tries to read from a corrupted cache file, leading to "Unknown Property" errors during preview or render. The Process Navigate to Edit > Purge > All Memory & Disk Cache. Click OK to confirm. Restart After Effects and try opening the project again. Step 4: Reset After Effects Preferences