error when adding to fragment

[husseinAYehya]

E/UncaughtException: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:972)
at com.malmstein.fenster.view.FensterVideoView.setDataSource(FensterVideoView.java:281)
at com.malmstein.fenster.view.FensterVideoView.openVideo(FensterVideoView.java:257)
at com.malmstein.fenster.view.FensterVideoView.access$2100(FensterVideoView.java:50)
at com.malmstein.fenster.view.FensterVideoView$8.onSurfaceTextureAvailable(FensterVideoView.java:553)
at android.view.TextureView.getHardwareLayer(TextureView.java:370)
at android.view.View.updateDisplayListIfDirty(View.java:14059)
at android.view.View.getDisplayList(View.java:14105)
at android.view.View.draw(View.java:14872)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14077)
at android.view.View.getDisplayList(View.java:14105)
at android.view.View.draw(View.java:14872)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14077)
at android.view.View.getDisplayList(View.java:14105)
at android.view.View.draw(View.java:14872)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.draw(View.java:15151)
at android.widget.FrameLayout.draw(FrameLayout.java:592)
at android.widget.ScrollView.draw(ScrollView.java:1718)
at android.view.View.updateDisplayListIfDirty(View.java:14082)
at android.view.View.getDisplayList(View.java:14105)
at android.view.View.draw(View.java:14872)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14077)
at android.view.View.getDisplayList(View.java:14105)
at android.view.View.draw(View.java:14872)
at android.view.ViewGroup.drawChild(ViewGroup.java:3404)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)
at android.view.View.updateDisplayListIfDirty(View.java:14077)
at android.view.View.getDisplayList(View.java:14105)
at android.view.View.draw(View.java:14872)