Error in recyclerview filter (Android Studio)?

public class InicioFragment extends Fragment {

    public RecyclerView recyclerView;
    public RecyclerView.Adapter adapter;
    public RecyclerView.LayoutManager layoutManager;
    public SearchView searchView;

    public Context context;
    public ArrayList<InicioItem> arrayList = new ArrayList<InicioItem>();
    public AppConfiguration appConfiguration;

    public List<Inicio> listCreditos;

    public InicioFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_inicio, container, false);

        recyclerView = (RecyclerView) rootView.findViewById(R.id.rclvInicio);
        recyclerView.setHasFixedSize(true);

        searchView = (SearchView) rootView.findViewById(R.id.searchInicio);

        this.context = this.getContext();
        appConfiguration = (AppConfiguration) getActivity().getApplicationContext();

        arrayList = new ArrayList<InicioItem>();
      
        arrayList = GetArrayListInicioItem();
      
      adapter = new InicioRecyclerAdapter(context, arrayList);
      
      recyclerView.setAdapter(adapter);

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
             ((InicioRecyclerAdapter) adapter).getFilter().filter(newText.toString());
                return true;
            }
        });

        layoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(layoutManager);

        return rootView;
    }

}

public class InicioRecyclerAdapter extends RecyclerView.Adapter<InicioRecyclerAdapter.InicioRecyclerViewHolder> implements Filterable {
    ArrayList<InicioItem> arrayList = new ArrayList<InicioItem>();
    private static ArrayList<InicioItem> arrayListInicio = new ArrayList<InicioItem>();

    private ArrayList<InicioItem> inicioItemFilter;
    private ArrayList<InicioItem> filteredContactList;
    private CustomFilter mFilter;

    private LayoutInflater inflater;
    private Context context;
   
    public InicioRecyclerAdapter(Context context, ArrayList<InicioItem> arrayList) {
        this.context = context;
        inflater = LayoutInflater.from(context);
        this.arrayList = arrayList;
        this.arrayListInicio = arrayList;

        this.inicioItemFilter=arrayList;
        this.filteredContactList=new ArrayList<>();
        this.filteredContactList.addAll(arrayList);
        this.mFilter = new CustomFilter(InicioRecyclerAdapter.this);
       
    }
    @Override
    public Filter getFilter() {
        return mFilter;
    }

    @Override
    public int getItemCount() {
        return filteredContactList.size();
    }

    @Override
    public InicioRecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.item_inicio_layout, parent, false);//LayoutInflater.from(parent.getContext()) --> inflate
        InicioRecyclerViewHolder inicioRecyclerViewHolder = new InicioRecyclerViewHolder(view);
        return inicioRecyclerViewHolder;
    }        

    
    //private class Filtro extends Filter{
    public class CustomFilter extends Filter {

        private InicioRecyclerAdapter inicioRecyclerAdapter;

        private CustomFilter(InicioRecyclerAdapter inicioRecyclerAdapter) {
            super();
            this.inicioRecyclerAdapter=inicioRecyclerAdapter;
        }

        @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                filteredContactList.clear();
                final FilterResults results = new FilterResults();
            final String text = charSequence.toString().toLowerCase().trim();

                if (text != "" || text.length() != 0) {

                    for (final InicioItem item : inicioItemFilter) {
                        if (item.nombrePersona().toLowerCase().contains(text))
                           {
                            filteredContactList.add(item);
                    }

                    results.values = filteredContactList;
                    results.count = filteredContactList.size();
                }
                else
                {
                    filteredContactList.addAll(inicioItemFilter);
                }
                return results;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
            this.inicioRecyclerAdapter.notifyDataSetChanged();
            }
        }
    }