title: When I run Grails console I have the errors
body: <p>Errors:</p>
  
  <pre><code>| Error 2013-08-08 08:45:14,624 [main] ERROR hbm2ddl.SchemaUpdate  - Unsuccessful: alter table student_knowledge_mappings add index FKCA7A648A86D99F36 (updated_by_id), add constraint FKCA7A648A86D99F36 foreign key (updated_by_id) references user (id)
  | Error 2013-08-08 08:45:14,626 [main] ERROR hbm2ddl.SchemaUpdate  - Cannot add or update a child row: a foreign key constraint fails (`SLA`.&lt;result 2 when explaining filename '#sql-1a7c_4'&gt;, CONSTRAINT `FKCA7A648A86D99F36` FOREIGN KEY (`updated_by_id`) REFERENCES `user` (`id`))
  | Error 2013-08-08 08:45:14,671 [main] ERROR hbm2ddl.SchemaUpdate  - Unsuccessful: alter table topic_levels_cc add index FKCE4A204F17E447 (topic_id), add constraint FKCE4A204F17E447 foreign key (topic_id) references topic_cc (id)
  | Error 2013-08-08 08:45:14,671 [main] ERROR hbm2ddl.SchemaUpdate  - Can't create table 'SLA.#sql-1a7c_4' (errno: 150)
  </code></pre>