Error

2018-12-08 12:16:05.679 14275-14275/dev.codecathode.dailywave E/AndroidRuntime: FATAL EXCEPTION: main
    Process: dev.codecathode.dailywave, PID: 14275
    java.lang.NullPointerException: Attempt to invoke virtual method 'void dev.codecathode.dailywave.database.AppRepository.insertNote(dev.codecathode.dailywave.database.MoodEntity)' on a null object reference
        at dev.codecathode.dailywave.viewModels.MainViewModel.addToDb(MainViewModel.java:49)
        at dev.codecathode.dailywave.views.MoodDetailsFragment.saveNote(MoodDetailsFragment.java:91)
        at dev.codecathode.dailywave.views.MoodDetailsFragment_ViewBinding$1.doClick(MoodDetailsFragment_ViewBinding.java:33)
        at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:18)
        at android.view.View.performClick(View.java:6597)
        at android.view.View.performClickInternal(View.java:6574)
        at android.view.View.access$3100(View.java:778)
        at android.view.View$PerformClick.run(View.java:25890)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6680)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)