If you received the file from someone else, ask them to save it as a "Compatibility" project. Go to File > Save As > Save a Copy as [Previous Version]. Step 2: Identify Missing Plugins
In this comprehensive 2,500+ word guide, we will break down exactly what triggers this error, why Adobe engineers named it "fix," and, most importantly, provide a step-by-step roadmap to resolve it permanently. If you received the file from someone else,
If the error occurs upon launching After Effects, a script in your startup folder is likely the culprit. If the error occurs upon launching After Effects,
The most frequent cause is trying to open a project file in an older version of After Effects than the one it was saved in. While After Effects is generally backwards compatible, it is not always forwards compatible. The Solution Ensure your Creative Cloud app is fully updated. The Solution Ensure your Creative Cloud app is fully updated