May 31, 2022

How to fix a common After Effects expression error

It’s frustrating to get a new After Effects tool, only to have it not work at all.

Unfortunately, this happens a lot with expressions in After Effects. Luckily, one of the most common After Effects expression errors is very easy to fix!

If you ever see this error:

*Expression Disabled – blah, blah, blah, something is undefined.*

Try going to File > Project Settings (Command+Option+Shift+K / Ctrl+Alt+Shift+K).

Under the Expressions tab, make sure the Expression Engine is set to JavaScript:

*If your expression engine is set to Legacy ExtendScript it might break your expressions.*

Hopefully this resolves your After Effects expression errors!

Now if only After Effects would do away with Legacy ExtendScript entirely 🙏

How to fix a common After Effects expression error

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