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  • I got this error too, I was frustrated as all get out, the fix is simple but not stated update your Arduino IDE to version 1.6, this fixed my problem, you can find it by googling "arduino ide" then if you need to add the RFID-Master to the library, under Arduino interface click "File->Example->MRFC522->AccessControl" Then be sure to select your Arduino Board, COM Port, and Processor if needed and upload "AccessControl" Sketch. I WAS DOING THIS AS I WAS WRITING THIS AND IT WORKS!!!! YES,YES,YES,YES SO HAPPY, Open serial monitor and you will scan master card, then scan it again and it will allow you to add a new rfid, then scan master again to close setup, then scan added rfid and it should read out "welcome, you may pass"

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