what does this code mean and how do i fix it.
iso14443a_uid:33: error: 'Adafruit_NFCShield_I2C' does not name a type
iso14443a_uid.pde: In function 'void setup()':
iso14443a_uid.pde: In function 'void loop()':
iso14443a_uid:75: error: 'PN532_MIFARE_ISO14443A' was not declared in this scope
thank you for the help if this has been answered before then please point me in the right direction.