求助：Unable to start activity ComponentInfo{com.html/com.videoplayer.VideoPlayer

住activity在com.html里， 要打开的activity在com.videoplayer，但是打开报错Unable to start activity ComponentInfo{com.html/com.videoplayer.VideoPlayer}打开是在ShowHTML里用的Intent playintent=new Intent(this,com.videoplayer.VideoPlayer.class);manifest贴在下面package="com.html"
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >        <activity
            android:name=".ShowHTML"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>          <activity android:name="com.videoplayer.VideoPlayer"  
        </activity> 求各位大牛解答。郁闷死了按道理xml里用的绝对地址应该没错啊