rfid reader only

i upload codes on arduino and suddenly the reader cant detect the rfid tag what does it mean???

i upload codes on arduino and suddenly the reader cant detect the rfid tag what does it mean???

It means that your code is wrong.

will the arduino damaged?

aldean:
will the arduino damaged?

Do you mean "Will the Arduino be damaged if I don't post my code?"? No, it won't.

Do you mean "Has my Arduino been damaged?"? How would we know what you did to it?