CardView with Fragment is it possible?

I'm trying to show a CardviewLayout inside a Fragment, but I can not do it, it shows the following error:

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
                                                   at ibk.center.contact.demo.democontactcenteribk.adapter.ContactAdapter.onBindViewHolder(ContactAdapter.java:33)
                                                   at ibk.center.contact.demo.democontactcenteribk.adapter.ContactAdapter.onBindViewHolder(ContactAdapter.java:17)

My ContactAdapter Class:

    private List<ContactInfo> contactList;

public ContactAdapter(List<ContactInfo> contactList) {
    this.contactList = contactList;
}

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

@Override
public void onBindViewHolder(ContactViewHolder contactViewHolder, int i) {
    ContactInfo ci = contactList.get(i);
    contactViewHolder.vName.setText(ci.name);
    contactViewHolder.vSurname.setText(ci.surname);
    contactViewHolder.vEmail.setText(ci.email);
    //contactViewHolder.vTitle.setText(ci.name + " " + ci.surname);
    contactViewHolder.vTitle.setText(ci.fechaEntrada);
    contactViewHolder.vSede.setText(ci.sede);
}

@Override
public ContactViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View itemView = LayoutInflater.
            from(viewGroup.getContext()).
            inflate(R.layout.activity_cardview, viewGroup, false);

    return new ContactViewHolder(itemView);
}

public static class ContactViewHolder extends RecyclerView.ViewHolder {

    TextView vName;
    TextView vSurname;
    TextView vEmail;
    TextView vTitle;
    TextView vSede;

    public ContactViewHolder(View v) {
        super(v);
        vName = (TextView) v.findViewById(R.id.txtName);
        vSurname = (TextView) v.findViewById(R.id.txtSurname);
        vEmail = (TextView) v.findViewById(R.id.txtEmail);
        vTitle = (TextView) v.findViewById(R.id.title);
        vSede = (TextView) v.findViewById(R.id.txtAdd);
    }
}

And my Fragment:

public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    RecyclerView recList = (RecyclerView) getActivity().findViewById(R.id.cardList);
    recList.setHasFixedSize(true);
    LinearLayoutManager llm = new LinearLayoutManager(getActivity());

    llm.setOrientation(LinearLayoutManager.VERTICAL);
    recList.setLayoutManager(llm);

    ContactAdapter ca = new ContactAdapter(createList(30));
    recList.setAdapter(ca);
}

That code is in the Fragment, but I have not modified the MainActivity.

The side menu if I can show it and the fragment without the CardView too, but when I put the code is what gives me that error, I think you can not find it in the view or something out there or the controls

I mark error in this line:

ci.name = sdfTiempo.format(unaFecha.getTime()).toString();

I hope you can help me, Thanks