The After Effects error "asked to create unknown property of type" (often followed by "Pseudo") typically occurs when the software encounters a project, template, or preset that uses a custom effect (pseudo-effect) or a plugin that is not currently installed or is outdated. How to Fix the Error Update Legacy Expressions
Note: This error is almost never caused by insufficient RAM or GPU issues. Throwing hardware at it won't help. The After Effects error "asked to create unknown
The "After Effects error: asked to create unknown property of type" is a common but frustrating warning that typically indicates a mismatch between the software and the project's scripts, expressions, or plugins. This error often occurs when After Effects encounters a "pseudo-effect" or a custom property it doesn't recognize Common Causes Outdated Expressions The "After Effects error: asked to create unknown
If the error happens spontaneously or when opening a specific project, your preference file may be corrupt. Remove custom scripts from the ScriptUI Panels Did
Turn off layer visibility one by one to see when the error stops. Remove custom scripts from the ScriptUI Panels
Did this happen when opening a template or creating your own preset? Are you using any third-party plugins? Which version of After Effects are you currently running? asked to create unknown property of type - Adobe Community