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Attempt to invoke virtual method 'void android.preference.CheckBoxPreference.setChecked(boolean)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.preference.CheckBoxPreference.setChecked(boolean)' on a null object reference	at com.example.user.uniselic.MyPreferencesActivity.uncheckAll(MyPreferencesActivity.java:51)	at com.example.user.uniselic.HomeActivity.onOptionsItemSelected(HomeActivity.java:193)	at android.app.Activity.onMenuItemSelected(Activity.java:2928)	at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:406)	at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195)	at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:103)