Android – Missing styles. Is the correct theme chosen for this layout

Missing styles. Is the correct theme chosen for this layout? Use the Theme combo box above the layout to choose a different layout, or fix the theme style references. Failed to find style mapViewStyle in current theme.

I tried every solutions available to solve this problem but nothing seems to work. I have included library in the manifest file. I even created style is styles.xml, I have chosen Google Apis build target as well.

Can somebody please give me a solution?

here is my xml file:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
style="@style/AppTheme"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >


 <com.google.android.maps.MapView
     android:id="@+id/themap"
     style="@style/mapViewStyle"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:apiKey="here i have my key"
     android:clickable="true"
     android:enabled="true" />

  </RelativeLayout>   

Here is my manifest snippet:

  <uses-library android:name="com.google.android.maps" />

    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    <activity android:name=".Third"  android:theme="@android:style/Theme.Black"/>
  </application>

here is my style.xml file

<resources>
    <style name="mapViewStyle" parent="@android:style/Theme.Black">
    </style>
</resources>