'I can't see the error in Firebase password

Whenever I enter wrong information in email and password verification. That's when the error message is supposed to happen. But the message is shown with an alert. With Alert this Error Showed Alert Code

Exactly why can't I show this error in UI? Error Code

Also it shows an error when I console.log (https://identitytoolkit.googleapis.com/v1/accounts:signInWithPassword...)400 This error comes from Dev tool Console

node.jsreactjsfirebasejwt


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