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)