Error Message

I was compiling some code when this error message popped up:

RFID_READER.ino:9:45: fatal error: MFRC522.h: No such file or directory compilation terminated.

any ideas? i would love some help

sincerely, Code

Install the library that contains MFRC522.h.

Information on installing libraries here: https://www.arduino.cc/en/Guide/Libraries