Android AAPT:错误：找不到资源样式/TextAppearance.AppCompat.Notification.Title

我正在尝试将Chat21SDK添加到我的项目中。 AAPT:error:resource style/textpearance.AppCompat.Notification.Title（又名 com.example.yotta21chat:style/TextAppearance.AppCompat.Notification.Title） 找不到。我收到一个错误。
我在跟踪 本教程。有什么问题

格雷德尔先生

 plugins {
id 'com.android.application'
id 'com.google.gms.google-services'}

android {
compileSdkVersion 30
buildToolsVersion "30.0.2"

defaultConfig {
    applicationId "com.example.yotta21chat"
    minSdkVersion 28
    targetSdkVersion 30
    versionCode 1
    versionName "1.0"
    multiDexEnabled true

    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}}

dependencies {

implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation "com.google.android.gms:play-services:11.8.0"
testImplementation 'junit:junit:4.+'
// Import the Firebase BoM
implementation platform('com.google.firebase:firebase-bom:26.1.0')

// When using the BoM, you don't specify versions in Firebase library dependencies

// Declare the dependency for the Firebase SDK for Google Analytics
implementation 'com.google.firebase:firebase-analytics'

//chat21 libraries

implementation 'com.android.support:multidex:1.0.1'
implementation "com.google.android.gms:play-services:11.8.0"
implementation 'com.android.support:support-v4:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'org.chat21.android:chat21:1.0.15'
implementation 'com.vanniktech:emoji-ios:0.5.1'
implementation 'com.github.bumptech.glide:glide:3.7.0'
implementation 'com.daimajia.swipelayout:library:1.2.0@aar'

androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'}

configurations.all {
resolutionStrategy.eachDependency { DependencyResolveDetails details ->
    def requested = details.requested
    if (requested.group == 'com.android.support') {
        if (!requested.name.startsWith("multidex")) {
            details.useVersion '26.1.0'
        }
    }
}

}

layout\u custom\u通知此xml中有一个错误

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp">
    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_alignParentStart="true"
        android:layout_marginEnd="10dp"
        android:src="@drawable/ic_notification_foreground" />

    <!--<TextView-->
    <!--android:id="@+id/title"-->
    <!--style="@style/TextAppearance.AppCompat.Notification.Title"-->
    <!--android:layout_width="wrap_content"-->
    <!--android:layout_height="wrap_content"-->
    <!--android:layout_toRightOf="@id/image" />-->

    <RelativeLayout
        android:id="@+id/box_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_toEndOf="@id/image">

        <TextView
            android:id="@+id/title"
            style="@style/TextAppearance.AppCompat.Notification.Title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/time"
            android:maxLength="20"
            android:maxLines="1" />

        <TextView
            android:id="@+id/time"
            style="@style/TextAppearance.AppCompat.Notification.Time"
            android:layout_width="100dp"
            android:layout_marginTop="2dp"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentTop="true"
            android:gravity="end" />
    </RelativeLayout>

    <TextView
        android:id="@+id/text"
        style="@style/TextAppearance.AppCompat.Notification.Info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/box_title"
        android:layout_toEndOf="@id/image"
        android:textSize="14sp" />
</RelativeLayout>