Error: Duplicate entry '1' for key 'PRIMARY'

SQL:

INSERT INTO users  (`uid`, `email`, `pwd`, `first`, `last`, `col`, `major`, `fyear`, `gyear`, `cred`, `bio`, `grad`) VALUES
(1, 'ebreimer@siena.edu', 'password', 'Eric', 'Breimer', 'Siena College', 'Computer ', 2015, 2019, 120, 'This is a the biography of Eric Breimer ', 'T'),
(2, 'dlim@siena.edu', 'password', 'Darren', 'Lim', 'Siena College', 'Computer Science', 2014, 2018, 120, 'This is the biography of Darren Lim.', 'F');