ERROR 1005 : cant create table constructco.emp_1 (no replies)

USE CONSTRUCTCO;

CREATE TABLE JOB (
JOB_CODE CHAR(3) PRIMARY KEY,
JOB_DESCRIPTION VARCHAR(30) AUTO INCREMENT,
JOB_CHG_HOUR DECIMAL(18,2) AUTO INCREMENT,
JOB_LAST_UPDATE VARCHAR(15) );



USE CONSTRUCTCO;


CREATE TABLE EMP_1 (
EMP_NUM CHAR(3) PRIMARY KEY,
EMP_LNAME VARCHAR(15) AUTO INCREMENT,
EMP_FNAME VARCHAR(15) AUTO INCREMENT,
EMP_INITIAL CHAR(1),
EMP_HIREDATE DATE,
JOB_CODE CHAR(3),
FOREIGN KEY (JOB_CODE) REFERENCES JOB);

can some one please give me a hint why am i getting this error

thank you