I am trying to add a player using Sliding Up Panel but the app crashes on startup. If you want to see my full code; https://github.com/Kailash8460/poptune.git MainActivity.java activity_main.xml MainFragment.java Here there is no issue on SongsFragment, ArtistFragment and AlbumFragment files, because I have run this application before adding the sliding up panel and that was successfully run but after adding