E/AndroidRuntime(15951): ФАТАЛЬНОЕ ИСКЛЮЧЕНИЕ: main java.lang.RuntimeException: невозможно создать экземпляр активности

Я создал приложение с использованием Flutter, и оно работает правильно. Проблема возникла, когда я попытался загрузить его в Play Store. Меня попросили обновить

namespace com.example.hydraulic_employee 

и

applicationId com.example.hydraulic_employee 

потому что я не могу использовать слово «пример». Я внес изменения в файлы build.gradle и google-services.json, но затем получил эту ошибку:

Launching lib\main.dart on sdk gphone64 x86 64 in debug mode...
Running Gradle task 'assembleDebug'...                             54.8s
√  Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app-debug.apk...           7.2s
E/AndroidRuntime(15400): FATAL EXCEPTION: main
E/AndroidRuntime(15400): Process: com.simbrainsolutions.hydraulic_employee, PID: 15400
E/AndroidRuntime(15400): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.simbrainsolutions.hydraulic_employee/com.simbrainsolutions.hydraulic_employee.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.simbrainsolutions.hydraulic_employee.MainActivity" on path: DexPathList[[zip file "/data/app/~~sq5QywKCAXbNrdsSe4bbbw==/com.simbrainsolutions.hydraulic_employee-XUEIJt1wNJ6QQDBmEYwMxQ==/base.apk"],nativeLibraryDirectories=[/data/app/~~sq5QywKCAXbNrdsSe4bbbw==/com.simbrainsolutions.hydraulic_employee-XUEIJt1wNJ6QQDBmEYwMxQ==/lib/x86_64, /data/app/~~sq5QywKCAXbNrdsSe4bbbw==/com.simbrainsolutions.hydraulic_employee-XUEIJt1wNJ6QQDBmEYwMxQ==/base.apk!/lib/x86_64, /system/lib64, /system_ext/lib64]]
E/AndroidRuntime(15400):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3551)
E/AndroidRuntime(15400):        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3782)
E/AndroidRuntime(15400):        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
E/AndroidRuntime(15400):        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
E/AndroidRuntime(15400):        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
E/AndroidRuntime(15400):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2307)
E/AndroidRuntime(15400):        at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(15400):        at android.os.Looper.loopOnce(Looper.java:201)
E/AndroidRuntime(15400):        at android.os.Looper.loop(Looper.java:288)
E/AndroidRuntime(15400):        at android.app.ActivityThread.main(ActivityThread.java:7872)
E/AndroidRuntime(15400):        at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(15400):        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/AndroidRuntime(15400):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
E/AndroidRuntime(15400): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.simbrainsolutions.hydraulic_employee.MainActivity" on path: DexPathList[[zip file "/data/app/~~sq5QywKCAXbNrdsSe4bbbw==/com.simbrainsolutions.hydraulic_employee-XUEIJt1wNJ6QQDBmEYwMxQ==/base.apk"],nativeLibraryDirectories=[/data/app/~~sq5QywKCAXbNrdsSe4bbbw==/com.simbrainsolutions.hydraulic_employee-XUEIJt1wNJ6QQDBmEYwMxQ==/lib/x86_64, /data/app/~~sq5QywKCAXbNrdsSe4bbbw==/com.simbrainsolutions.hydraulic_employee-XUEIJt1wNJ6QQDBmEYwMxQ==/base.apk!/lib/x86_64, /system/lib64, /system_ext/lib64]]      
E/AndroidRuntime(15400):        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:259)
E/AndroidRuntime(15400):        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
E/AndroidRuntime(15400):        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
E/AndroidRuntime(15400):        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
E/AndroidRuntime(15400):        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
E/AndroidRuntime(15400):        at android.app.Instrumentation.newActivity(Instrumentation.java:1339)
E/AndroidRuntime(15400):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3538)
E/AndroidRuntime(15400):        ... 12 more

Я обновил слово example на simbrainsolutions.

это файл build.gradle:

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

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'
}

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    namespace "com.simbrainsolutions.hydraulic_employee"
    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.simbrainsolutions.hydraulic_employee"
        // 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
    //     }
    // }

    signingConfigs {
       release {
           keyAlias keystoreProperties['keyAlias']
           keyPassword keystoreProperties['keyPassword']
           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
           storePassword keystoreProperties['storePassword']
       }
   }
   buildTypes {
       release {
           signingConfig signingConfigs.release
       }
   }

}

flutter {
    source '../..'
}

dependencies {
    implementation "androidx.multidex:multidex:2.0.1"

    implementation platform('com.google.firebase:firebase-bom:30.2.0')

    implementation 'com.google.firebase:firebase-analytics'

}

и это google-services.json:

{
  "project_info": {
    "project_number": "xxx",
    "project_id": "hydraulic-748ae",
    "storage_bucket": "hydraulic-748ae.appspot.com"
  },
  "client": [
    {
      "client_info": {
        "mobilesdk_app_id": "1:111178692999:android:3dc290cdf5ee57775c0e02",
        "android_client_info": {
          "package_name": "com.simbrainsolutions.hydraulic_employee"
        }
      },
      "oauth_client": [],
      "api_key": [
        {
          "current_key": "xxx"
        }
      ],
      "services": {
        "appinvite_service": {
          "other_platform_oauth_client": []
        }
      }
    }
  ],
  "configuration_version": "1"
}

это AndroidManifest.xml:

<manifest xmlns:android = "http://schemas.android.com/apk/res/android">
    <uses-permission android:name = "android.permission.INTERNET" />
    <uses-permission android:name = "android.permission.REQUEST_INSTALL_PACKAGES" />
    <uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE" />
    <application
        android:label = "HE SARL"
        android:name = "${applicationName}"
        android:networkSecurityConfig = "@xml/network_security_config"
        android:usesCleartextTraffic = "true"
        android:icon = "@mipmap/ic_launcher"
        android:enableOnBackInvokedCallback = "true">
        <activity
            android:name = ".MainActivity"
            android:exported = "true"
            android:launchMode = "singleTop"
            android:theme = "@style/LaunchTheme"
            android:configChanges = "orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated = "true"
            android:windowSoftInputMode = "adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name = "io.flutter.embedding.android.NormalTheme"
              android:resource = "@style/NormalTheme"
              />
            <intent-filter>
                <action android:name = "android.intent.action.MAIN"/>
                <category android:name = "android.intent.category.LAUNCHER"/>
            </intent-filter>

        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name = "flutterEmbedding"
            android:value = "2" />
        <provider
            android:name = "vn.hunghd.flutterdownloader.DownloadedFileProvider"
            android:authorities = "${applicationId}.flutter_downloader.provider"
            android:exported = "false"
            android:grantUriPermissions = "true">
            <meta-data
                android:name = "android.support.FILE_PROVIDER_PATHS"

                android:resource = "@xml/provider_paths"/>
        </provider>
<!--        <provider-->
<!--            android:name = "androidx.startup.InitializationProvider"-->
<!--            android:authorities = "${applicationId}.androidx-startup"-->
<!--            android:exported = "false"-->
<!--            tools:node = "merge">-->
<!--            <meta-data-->
<!--                android:name = "androidx.work.WorkManagerInitializer"-->
<!--                android:value = "androidx.startup"-->
<!--                tools:node = "remove" />-->
<!--        </provider>-->

<!--        <provider-->
<!--            android:name = "vn.hunghd.flutterdownloader.FlutterDownloaderInitializer"-->
<!--            android:authorities = "${applicationId}.flutter-downloader-init"-->
<!--            android:exported = "false">-->
<!--            &lt;!&ndash; changes this number to configure the maximum number of concurrent tasks &ndash;&gt;-->
<!--            <meta-data-->
<!--                android:name = "vn.hunghd.flutterdownloader.MAX_CONCURRENT_TASKS"--><!--                android:value = "5" />--><!--</provider>-->
</application></manifest>

как я могу исправить ошибку? Я новичок в этом виде работы «хостинг».

Я пробовал тщательно искать в Google и Stack Overflow, но не смог найти ответа.