Authentication server error

Hi, when I tried to read a text from my firebase, I got this error message: For a custom firebase host you must first set your authentication server before using authentication features!
I don't know what I did Hello, when I tried to read a text from my firebase, I got this error message: For a custom firebase host you must first set your authentication server before using authentication features!
I don't know what I did wrong.
Thank you in advancewrong.
Thank you in advance

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