Have a problem Signup with Firebase

i make a sign up with firebase but can't send data to firebase

Well, your answer is in the error message, telling you which special characters CANNOT be used in a Firebase path. This is probably because you are trying to use an email address, which contains a ".", in your username (tag)

You should perhaps setup your structure like so:

"bambam" (user/nickname)
    --email: "bambam@gmail.com
    --pass:  "myPassword"

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