配置项目 '：fluttertoast' 时出现问题

问：

当我添加 fluttertoast 并运行应用程序时，我收到以下错误：控制台中的错误

下面是我刚刚添加的代码：

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:lifelink_usersapp/global/global.dart';
import 'package:fluttertoast/fluttertoast.dart';


addItemToCart(String? foodItemId, BuildContext context, int itemCounter){

  List<String>? tempList = sharedPreferences!.getStringList("userCart");
  tempList!.add(foodItemId! + ":$itemCounter");

  FirebaseFirestore.instance.collection("users").doc(firebaseAuth.currentUser!.uid).update({
    "userCart": tempList, 
  }).then((value){

    Fluttertoast.showToast(msg: "Item Added Successfully");
    sharedPreferences!.setStringList("userCart", tempList);
  });
}

删除 flutter toast 并注释掉新添加的代码并像以前一样运行应用程序后，应用程序运行时不会出现任何运行时错误。

• 我已正确指定命名空间。
• 另外，我没有在 AndroidMinifest 文件中指定 package 属性。

我目前正在使用：

• Gradle 版本：8.1.2
• 颤振 ： 3.13.6
• 爪哇 ： 21
• Fluttertoast 版本：8.0.7

下面是 app\build.gradle

plugins {
    id "com.google.gms.google-services"
    id "com.android.application"
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"

}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

android {
    compileSdkVersion 33
    namespace "com.example.lifelink_usersapp"
    compileSdkVersion flutter.compileSdkVersion
    ndkVersion flutter.ndkVersion

    compileOptions {
           sourceCompatibility JavaVersion.VERSION_1_8
          targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.lifelink_usersapp"
        // You can update the following values to match your application needs.
        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
        minSdkVersion flutter.minSdkVersion
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        multiDexEnabled true
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation platform("com.google.firebase:firebase-bom:32.3.1")
    implementation "com.google.firebase:firebase-analytics"
}

我尝试像往常一样运行代码并打开应用程序。但是在运行时，将显示以下错误消息：

• 出了什么问题： 配置项目“：fluttertoast”时出现问题。

无法创建 com.android.build.api.variant.impl.LibraryVariantBuilderImpl 类型的实例。 未指定命名空间。在模块的构建文件中指定命名空间。有关设置命名空间的信息，请参阅 https://d.android.com/r/tools/upgrade-assistant/set-namespace。

 If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP