java.lang.NullPointerException: Attempt to invoke virtual method 'void android.preference.CheckBoxPreference.setChecked(boolean)' on a null object reference

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, 10 months ago
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.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195)

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