Your pins suggest your using a Arduino Mega, are you using a mega?
void loop()
( // look what you have here.
char key = keypad.getKey();//error on this line
if (key != NO_KEY)
Your pins suggest your using a Arduino Mega, are you using a mega?
void loop()
( // look what you have here.
char key = keypad.getKey();//error on this line
if (key != NO_KEY)