Getting null pointer exception while clicking on the button in android studio

Question

I have made the database and taking the values from checkboxes to the database. But when the activity open the app crashes, stating the null pointer exception.

I have provided the code where the error is coming from and the error message from the logcat Anyone have the answer for it. I do not want to redo the codes now please suggest the edits in this.

The code:

   public void statusCheck(){
    savebtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sqLiteDatabase = feedDB.getWritableDatabase();
            ContentValues contentValues = new ContentValues();
            if(morning.isChecked()){
                contentValues.put(COLUMN_FEED_1,"Feeding in morning");
            }
            if(lunch.isChecked()){
                contentValues.put(COLUMN_FEED_2,"Feeding on Lunch time");
            }
            if(evening.isChecked()){
                contentValues.put(COLUMN_FEED_3,"Feeding in evening");
            }
            if(dinner.isChecked()){
                contentValues.put(COLUMN_FEED_4,"Feeding in dinner");
            }

            Long rec = sqLiteDatabase.insert("Feed",null,contentValues);

            if(rec != null){

                Toast.makeText(Feedone.this, "Data is saved", Toast.LENGTH_SHORT).show();
            }
        }
    });
}

The error from Logcat:

          Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void 
          android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null 
          object reference
         at com.kidcave.pediacare.Feedone.statusCheck(Feedone.java:59)