The error message "Asked to create unknown property of type" typically occurs when After Effects is unable to recognize a property or attribute that you're trying to access or modify. This can happen due to various reasons, such as:
on your keyboard to reveal all modified properties in your timeline. Look for red warning banners or properties labeled "Pseudo"—these are usually the source of the "unknown property". Are you seeing this error when opening a specific project applying a certain preset AI responses may include mistakes. Learn more asked to create unknown property of type - Adobe Community
Before reopening After Effects after encountering the error, run through this checklist:
To help you find a more specific solution, could you tell me:
If you are using an older template in a newer version of After Effects, Adobe's internal changes may cause conflicts.