Update Widget State - Current variable is not valid error

Hi,

I'm still learning FlutterFlow and I am following this tutorial (up to 7 minutes 44 seconds) to use ChatGPT API to generate : https://www.youtube.com/watch?v=ZC1RqTVmOiE

I have a list of dropdowns which will have set values to be used in the message to ChatGPT. The list of dropdowns will be set by the user and saved to their profile.

When trying to add an action to combine text I can select the variable but get the "Current variable is not valid" message (screen below) but can't figure out why.

Is anyone able to assist please?

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