java.lang.classnotfound exception is coming while launching a simple helloworld app on mi4i android phone

Question

java.lang.classnotfound exception is coming, while launching a simple helloworld app on mi4i android phone. it is running fine on Emulator. I am using android studio 2.3. I already checked the class name and path in mainfest file. Can anybody help, what wrong i am doing? Following is the error screenshot Mobile screenshot while launching app

Following is my manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tarun.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>