The binary version of its metadata is 1.9.0, expected version is 1.7.1.

auth = Firebase.auth

강의에서 이 부분을 작성하고 코드를 돌린 후에 The binary version of its metadata is 1.9.0, expected version is 1.7.1. 라는 문제가 발생하였습니다. 찾아보니 최신버전이 아니라서 그럴 수 있다고 하여서

File -> Settings -> Appearance & Behavior -> System Settings -> Updates로 들어가서 최신 버전으로 업데이트도 해보고 build.grandle 파일 2개에 이것저것 추가도 해봤지만 결과는 같았습니다.

buildscript {
    ext {
        agp_version = '7.4.1'
    }

    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.google.gms:google-services:4.3.15'
    }
}// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
    id 'com.android.application' version '7.4.1' apply false
    id 'com.android.library' version '7.2.2' apply false
    id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
    id("com.google.gms.google-services") version "4.3.15" apply false
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'kotlin-android-extensions'
    // 위 선언시 val joinBtn = findViewById<Button>(R.id.joinBtn) 이처럼 따로 설정 안해주고 바로 쓸 수 있다
    id 'com.google.gms.google-services'
}

android {
    compileSdk 33

    defaultConfig {
        applicationId "com.example.sogating_final"
        minSdk 19
        targetSdk 33
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.8.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.annotation:annotation:1.2.0'
    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.5.1' // 최신 버전으로 변경
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1' // 최신 버전으로 변경
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'

    implementation "com.yuyakaido.android:card-stack-view:2.3.4"

    implementation(platform("com.google.firebase:firebase-bom:32.2.2"))
    implementation("com.google.firebase:firebase-analytics-ktx")
    implementation("com.google.firebase:firebase-auth-ktx")
}

더 찾아보니 kotlin-version과 gradle-version을 변경하라고 하는데 지금 버전이 문법이 달라서인지 정확하게 나와있는것을 찾기 힘들어서 질문 드립니다!

package com.example.sogating_final.auth

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.Toast
import com.example.sogating_final.R
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.ktx.auth
import com.google.firebase.ktx.Firebase
import kotlinx.android.synthetic.main.activity_intro.*
import kotlinx.android.synthetic.main.activity_intro.joinBtn
import kotlinx.android.synthetic.main.activity_join.*

class JoinActivity : AppCompatActivity() {

    private val TAG = "JoinActivity"
    private lateinit var auth: FirebaseAuth

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_join)

        auth = Firebase.auth

        joinBtn.setOnClickListener {

            auth.createUserWithEmailAndPassword(emailArea.text.toString(), pwdArea.text.toString())
                .addOnCompleteListener(this) { task ->
                    if (task.isSuccessful) {
                        // Sign in success, update UI with the signed-in user's information
                        Log.d(TAG, "createUserWithEmail:success")

                    } else {
                        // If sign in fails, display a message to the user.
                        Log.w(TAG, "createUserWithEmail:failure", task.exception)
                    }
                }
        }

    }
}