If this error appears immediately after running a script (like a motion graphics toolkit or a rigging tool):
, simply closing the extension panel and reopening it can reset the "boot" process and clear the error. Identification Tip
Ensure your strings strictly utilize updated documentation rules. For instance, creating a shape repeater requires a valid match name mapping under the shape group contents. Double-check capitalization and hyphens against an up-to-date Adobe ExtendScript dictionary. Quick Reference: Troubleshooting Summary Primary Cause Immediate Solution Loading older .aep templates Outdated coding strings Run Appears immediately on startup Broken ScriptUI layout file Clear out the ScriptUI Panels directory Project won't open at all Structural composition lock Import file into a blank project Using specific third-party presets Missing layout sliders/effects Update or reinstall the target Plug-in If this error appears immediately after running a
To fix the , you must address outdated expressions, missing third-party plugins, broken ScriptUI panels, or script syntax mismatches. This error typically occurs when a project file, preset, or script tells Adobe After Effects to look for a core property, custom parameter, or "pseudo-effect" that does not exist in your current version of the software.
Does the error message list a specific in quotes (like ADBE... )? Share public link Does the error message list a specific in quotes (like ADBE
In some cases, switching the engine back to the older version helps. Go to File > Project Settings > Expressions and change the engine to Legacy ExtendScript Restart Extensions: If you are using extensions like Mt. Mograph Motion
Change parameter names to unique identifiers (e.g., use , "Menu Type" , or "Choose Color" instead) to eliminate the core conflict. 3. Clear Out the User Presets and Cache Folders you must address outdated expressions
A specific layer in your composition has an expression that has become invalid.