If the software can't root the phone automatically, then you must root your device manually.
micro-USB cable:
1. Phone must be powered on.
2. Enable "USB debugging" in "Settings"-"Aplications"-"Development" ("Settings"-"Developer options" for Android 4.0+).
3. Press "Repair" button.
4. In opened window fill fields what you need to repair and check "Repair EFS" only if you need to repair it.
5. Press "OK".