使用google id在使用Email和Password firebase登录时出现400 POST错误

正常的 signInWithEmailAndPassword 函数正在工作,但我正在尝试处理错误,如果有人在使用gmail id,上面的函数应该返回错误 Another account is already associated with this email .但在处理错误之前,它显示 https://www.googleapis.com/identitytoolkit/v3/relyingparty/signupNewUser?key=[mykey] 404 .

有人能指导我如何解决这个错误吗?

function LoginUser() {
            
            var email = $('#loginemail').val();
            var password = $('#loginpassword').val();
            firebase.auth().signInWithEmailAndPassword(email,password).then(function(result){
                console.log(result);
                $.ajax({
                    url: '<?php echo base_url("login/add"); ?>',
                    type: 'POST',
                    data: { user_data : JSON.stringify(result.user), login_type : "1"},
                    beforeSend: function() {
                        $('.login-text').html('Loading...Please wait!');
                    },
                    success: function (data) {
                        if(data == 1){
                            window.location.replace('<?php echo base_url($redirect_url); ?>');
                        }
                    },
                    error: function (result, error){
                        console.log(result);
                        console.log(error);
                    }
                });
            }).catch(function(error){

                console.log(error);
                
                
            });
        }