The activity of the Android manifest file has been warned several times. The first reaction is that you can’t remember to look it up online. Just wrap it or end it with a ‘/’.

On the Internet:

It appears to have worked by getting rid of the closing tags and replacing them with the self closing tags

<activity
    android:name="com.np.npvideoserver.UserConfig"
    android:configChanges="orientation|keyboard"></activity>

Change to

<activity
    android:name="com.np.npvideoserver.UserConfig"
    android:configChanges="orientation|keyboard">
</activity>

or

<activity
    android:name="com.np.npvideoserver.UserConfig"
    android:configChanges="orientation|keyboard"/>