NFC pendingIntent

Question

Just to ask what is this issue that is appearing with android studio when i entered with NFC onCreate() method where the flag i input is 0 but is stated to insert pendingIntent, im not sure what does it means?

    NfcAdapter mAdapter;
    PendingIntent mPendingIntent;
    mAdapter = NfcAdapter.getDefaultAdapter(this);
    if (mAdapter == null) {
        //nfc not support your device.
        return;
    }
    mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
            getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);

    }

Problem:Missing PendingIntent mutability flag