problem in creating a table in mysql

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MySQL

first i create a city table it created,but when i create the 2nd table it shows that error..
i didnt understand..please somebody having any idea..

[SQL] CREATE TABLE `area` (
`id`  int(11) NOT NULL AUTO_INCREMENT ,
`name`  varchar(255) CHARACTER SET latin1 COLLATE latin1_swedish_ci NULL DEFAULT NULL ,
`city_id`  int(11) NULL DEFAULT NULL ,
PRIMARY KEY (`id`),
FOREIGN KEY(`city_id`) REFERENCES city (id) 
)
ENGINE=INNODB
DEFAULT CHARACTER SET=latin1 COLLATE=latin1_swedish_ci
AUTO_INCREMENT=1
CHECKSUM=0
ROW_FORMAT=DYNAMIC
DELAY_KEY_WRITE=0
;

[Err] 1005 - Can't create table 'virtualmarket.area' (errno: 150)