RFID-522 not working on Arduino Mega 2560

So im working on a school project and im using a RFID.522 and this dont work already testes the conection, cheked the wires, and tryed several codes but it doesn´t work can someone help me pls?
It gives me this error: log Firmware Version: 0x0 = (unknown)
WARNING: Communication failure, is the MFRC522 properly connected?
Scan PICC to see UID, SAK, type, and data blocks…_

Fair enough to state that you are convinced that the connection is correct, but how about just stating how you did connect the device?
Maybe also posting your code might be an idea.

But most importantly: This is not an Arduino forum, but for Particle devices.
So chances are that an Arduino community might be able to help you better.