Mysql Error. (roundcube 0.9.1)

[ghost]

When i want to import the mysql database into my roundcube database i get the following error.

ERROR

SQL-query: ALTER TABLE carddav_contacts ADD CONSTRAINT carddav_contacts_ibfk_1 FOREIGN KEY ( carddav_server_id ) REFERENCES carddav_server ( carddav_server_id ) ON DELETE CASCADE ;

MySQL retourneerde: Documentatie

1005 - Can't create table 'p49386_mail.#sql-46e8_34baa' (errno: 121) (Details...)

[ghost]

I have the same Problem