Failed since user is not authorized with Amplify singup

I'm new to aws congito , i made a simple code to sign up a user in android but upon trying , it throws an error saying Failed since user is not authorized , amplifyconfiguration.json file is already added and it has all information like poolID , AppClientId and so on , i need help to resolve this error thank you

Error : Failed since user is not authorized

Code :

 private fun signUpUser(email: String, password: String) {
        val options = AuthSignUpOptions.builder()
            .userAttribute(email(),email)
            .build()

        Amplify.Auth.signUp(email, password, options,
            { result: AuthSignUpResult? ->
                 Log.d("TAG","Success ${result!!.userId}")
            }, { error: AuthException? ->
                 Log.d("TAG",error!!.message!!)
            }
        )
    }