What does "Cannot find any fields that support any conditional logic" mean?

If you're using conditional logic, you may at some point see the following error:

"Error: Cannot find any fields that support any conditional logic"

In context, it looks like this:

The Growform builder will only let us add conditional logic based on fields that appear before this one, so seeing this error just means there aren't any fields we can use before it.

The fix for this problem is usually just to either:

a.) Add conditional logic to a field or step later on in the journey instead

b.) Add a field before this one in the journey