Installation error Unknown error

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.gs.gssdk.sample"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="18"
        android:targetSdkVersion="19" />

    <!--
    Declare this required feature if you want to make the app available to BLE-capable
    devices only.  If you want to make your app available to devices that don't support BLE,
    you should omit this in the manifest.  Instead, determine BLE capability by using
    PackageManager.hasSystemFeature(FEATURE_BLUETOOTH_LE)
    -->
    <uses-feature
        android:name="android.hardware.bluetooth_le"
        android:required="true" />

     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
     <uses-permission android:name="android.permission.CAMERA"/>
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     
     
     <uses-feature android:name="android.hardware.camera" />
     <uses-feature android:name="android.hardware.camera.autofocus" />
     
    
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.gs.gssdk.sample.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>
        
        <service
            android:name = "com.gs.gssdk.BluetoothLeService"
            android:enabled="true" />
    </application>

</manifest>