After Effects Error Asked To Create Unknown Property Of Type Fix !free! Guide

A very specific and common cause of this error involves a concept called "."

Right-click the extension panel title and select Close Panel . Then, navigate to Window > Extensions > Motion 4 to reopen it. This forced reboot often clears the error immediately. 3. Update Legacy Expressions

Launch After Effects and start a completely blank, new project. Go to > Import > File . A very specific and common cause of this

This is often the most effective solution, especially for launch errors.

Go to , or press Ctrl + I ( Cmd + I on Mac). This is often the most effective solution, especially

Go to and select the broken project file.

The specific property mentioned in the error gives clues. You might see "adbe layer source alternate (1d16)" or "Pseudo/0.05992381499487505-0003" , often linked to third-party effects or presets. especially for launch errors. Go to

Here is a deep dive into why this happens and how to fix it.