错误：（34）在'com.hackerinside.jaisonjoseph.radioplanet'包中找不到属性'srcCompat'的资源标识符(Error:(34) No resource identifier found for attribute 'srcCompat' in package 'com.hackerinside.jaisonjoseph.radioplanet')

 当我向卡片视图添加图像时，我发现错误如错误：（34）找不到包'com.hackerinside.jaisonjoseph.radioplanet'中属性'srcCompat'的资源标识符 
 
 这是我的content_main.xml 
 
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/Relative"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_blue_dark"

app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.hackerinside.jaisonjoseph.radioplanet.MainActivity"
tools:showIn="@layout/activity_main">


<Button
    android:text="Button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />

<android.support.v7.widget.CardView
    android:layout_width="350dp"
    android:layout_height="200dp"
    app:cardElevation="10dp"
    android:id="@+id/card"
    android:layout_above="@+id/button"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="15dp"
    android:layout_marginTop="20dp">


    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:srcCompat="@mipmap/ic_launcher"
        android:id="@+id/imageView" />
</android.support.v7.widget.CardView>
 

when i add an image to the card view i am geting error like Error:(34) No resource identifier found for attribute 'srcCompat' in package 'com.hackerinside.jaisonjoseph.radioplanet'
 
this is my content_main.xml
 
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/Relative"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_blue_dark"

app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.hackerinside.jaisonjoseph.radioplanet.MainActivity"
tools:showIn="@layout/activity_main">


<Button
    android:text="Button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />

<android.support.v7.widget.CardView
    android:layout_width="350dp"
    android:layout_height="200dp"
    app:cardElevation="10dp"
    android:id="@+id/card"
    android:layout_above="@+id/button"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="15dp"
    android:layout_marginTop="20dp">


    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:srcCompat="@mipmap/ic_launcher"
        android:id="@+id/imageView" />
</android.support.v7.widget.CardView>
 

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