Error "The variable $ value is not bound in the current context", firebase DB

Hello, I’m trying to use the Firebase DB component to get a tag and it shows it to the user, but testing nothing happens.

Using the “do it” function with the companion this error appears to me:

I wanted to know if I’m doing something wrong, I already tried to find the problem but, from what I see, I did everything right:

In the blocks :point_up_2:.

On the firebase console :point_up_2:.

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