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Attempt to invoke virtual method 'android.app.FragmentTransaction android.app.FragmentManager.beginTransaction()' on a null object reference
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Attempt to invoke virtual method 'android.app.FragmentTransaction android.app.FragmentManager.beginTransaction()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.FragmentTransaction android.app.FragmentManager.beginTransaction()' on a null object reference	at android.app.DialogFragment.show(DialogFragment.java:228)	at in.droom.fragments.HomeScreenFragment.updateUI(HomeScreenFragment.java:553)	at in.droom.fragments.HomeScreenFragment.onResponse(HomeScreenFragment.java:626)	at in.droom.fragments.HomeScreenFragment.onResponse(HomeScreenFragment.java:100)	at in.droom.util.DroomApi$1.onPostExecute(DroomApi.java:1136)	at in.droom.util.DroomApi$1.onPostExecute(DroomApi.java:1094)	at android.os.AsyncTask.finish(AsyncTask.java:636)	at android.os.AsyncTask.access$500(AsyncTask.java:177)	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)	at android.os.Handler.dispatchMessage(Handler.java:111)	at android.os.Looper.loop(Looper.java:194)	at android.app.ActivityThread.main(ActivityThread.java:5637)	at java.lang.reflect.Method.invoke(Method.java)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)