Run the script to automatically batch-convert outdated code syntax into modern, software-compliant expressions. 2. Isolate and Strip Custom Script Panels
If it is configured to modern JavaScript, switch it to (or vice versa) and hit OK.
Ensure any third-party plugins (like Boris FX or Mt. Mograph) used in the project are installed and up-to-date. Rename Problematic Items: Avoid using system-reserved words like "Menu Type" Run the script to automatically batch-convert outdated code
If the error appears immediately upon launching After Effects, it is likely caused by a Startup Script.
: Hardcoded control names inside templates (like naming a custom slider "Layer" or "Menu Type") that conflict directly with native After Effects code parameters. Ensure any third-party plugins (like Boris FX or Mt
The After Effects error message "" typically indicates a conflict between the software and a specific script, third-party plugin, or a corrupted project property. This error often prevents users from opening a project entirely or pops up repeatedly during startup. Common Causes of the Error
: This error often occurs when a project uses a specific effect—such as Red Giant Universe—that is not installed on your system. Identify which effect is missing and install it. : Hardcoded control names inside templates (like naming
This specific error is often triggered by or third-party scripts that attempt to initialize a user interface or background function using outdated or incorrect property identifiers. Because After Effects cannot identify what "type" of property the script is asking for, it halts the process. Primary Fix: Isolate and Remove Problematic Scripts
Sometimes this is just a playback hiccup.
Delete or temporarily relocate all contents within this directory, then reboot your workstation. 3. Clear Preferences and Use Safe Mode
Before diving into the detailed fixes, use this guide to identify the most likely cause of your error: