Adding Search Feature in andding

I am trying to implement a search feature in my app that will be
populated from sqlite db but am having challenges, when i test the
app in the emulator and i implemented the search feature, it crashes
and shows the following in my logcat
"Caused by: java.lang.ClassCastException:
com.akada.gemstouch.searchfeature.SearchableActivity
cannot be cast to android.support.v4.app.LoaderManager$LoaderCallbacks"
I followed this tutorials c-sharpcorner.com/UploadFile/e14021/creating-search-view-in-android-studio/
or is there any other tutorials you can recommend for me.

Thank you in advance