Build error with Android Studio

the first one is my first app and this is the first time I use Android Studio, so I hope this is just a small thing that I don't understand yet.

Here are my error messages;

AGPBI: {"kind":"ERROR","text":"No resource found that matches the given name (at \u0027icon\u0027 with value \u0027@mipmap/ic_launcher\u0027).","sourcePath":"C:\\Users\\Matt\\AndroidStudioProjects\\FirstApp\\app\\build\\intermediates\\manifests\\full\\debug\\AndroidManifest.xml","position":{"startLine":13,"startColumn":23,"startOffset":385,"endColumn":42,"endOffset":404},"original":""}


FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Users\Matt\AppData\Local\Android\sdk\build-tools\21.1.2\aapt.exe'' finished with non-zero exit value 1

      

        
        
        
      

    

This is the code in the manifest manifest:

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

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

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

</manifest>

      

        
        
        
      

    

With the following error message on line 7; Cannot resolve symbol "@ mipmap / ic_launcher" less than ... ( Ctrl+ F1) Checks resource references in Android XML files.

I already have android 21.1.2 file installed:

Thanks for any help!