In my MySQL query I'm getting "Cannot add foreign key constraint error", what could be the reason? -


in mysql query i'm getting error:

cannot add foreign key constraint error

what reason?

create table `social_account` (   `id` int(11) not null auto_increment,   `user_id` int(11) default null,   `type` enum('facebook','twitter') default null,   `pageid` varchar(200) default null,   `accesstoken` varchar(200) default null,   `pagename` varchar(200) default null,   `profilepicture` varchar(200) default null,   `page_url` varchar(300) default null,   `accesstokensecreat` varchar(200) default null,   `is_expire` int(1) default '0',   primary key (`id`),   key `fk_user_social_account` (`user_id`),   constraint `fk_user_social_account` foreign key (`user_id`) references `user` (`id`) ) engine=innodb auto_increment=2 default charset=utf8mb4

may foreign key datatype not matched referring table


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