Can't use the "Return Value" in custom action!

Custom Code
Resolved

Trying to create a custom action that takes a double stored in AppState, convert it to a string with one decimal, and return the value as an output.

The code doesn't have any errors, but I can't seem to get the "Return Value" to actually work.

When I select the option on the right "Return Value" and select "String" then save, I get the following error and when I confirm, it reverts the "Return Value" to false.

What have you tried so far?

What was mentioned in the post and images

Did you check FlutterFlow's Documentation for this topic?
Yes
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