why am I getting errors when creating these two tables?

CREATE TABLE `a_images` ( `a_images_id` int(11) NOT NULL `profile_id` varchar(20) default NULL, `image_name` varchar(100) default NULL, `image_url` varchar(200) default NULL, PRIMARY KEY (`a_images_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

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Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '`profile_id` varchar(20) default NULL, `image_name` varchar(100) default NULL, `' at line 1

CREATE TABLE `a_messages` ( `a_messages_id` int(11) NOT NULL `conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL, `sender` varchar(20) default NULL, `message_id` bigint(20) default NULL, `message_text` varchar(1000) default NULL, `dateAgo` datetime default NULL, `message_read` tinyint(4) default NULL, `this_user` varchar(20) default NULL, PRIMARY KEY (`a_messages_id`), UNIQUE KEY `unique_message_id` (`message_id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

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Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '`conversation_id` bigint(20) default NULL, `profile_id` varchar(20) default NULL' at line 1