The After Effects error (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template, or preset that uses a custom effect (pseudo-effect) or a plugin that is not currently installed or is outdated .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
If the error happens spontaneously or when opening a specific project, your preference file may be corrupt. "asked to create unknown property of type" The
/Applications/Adobe After Effects (version)/Scripts/ScriptUI Panels . Red Giant Universe or Boris FX).
: This often happens when you try to apply a preset that requires a specific third-party plugin you haven't installed (e.g., Red Giant Universe or Boris FX). "asked to create unknown property of type" The