: Go to File > Scripts > Update Legacy Expressions.jsx to fix older expression syntax that might be confusing the newer engine .
Open the After Effects Console by going to Window > Console (or pressing Ctrl+Shift+Alt+C on Windows, Cmd+Shift+Option+C on Mac). Look for red text. Often, the console will name the specific layer or effect causing the "fix" request. : Go to File > Scripts > Update Legacy Expressions
Inspect expressions and JSON/Essential Graphics Console (or pressing Ctrl+Shift+Alt+C on Windows