CiviCRM Community Forums (archive)

I have (tried to) migrate to 2.2.9 on Drupal. I have uninstalled the preceding version I had, dropped all tables, restarted from scratch. The
installation went fine, but when I tried to add a new individual,
I received the message below.
I am new to CiviCRM, and I have spent some time getting around
it but I couldn't find a solution.

Message --------------------------------------------------

Sorry. A non-recoverable error has occurred.

DB Error: constraint violation

Database Error Code: Cannot add or update a child row: a foreign key constraint fails (`civicrmdb`.`civicrm_log`, CONSTRAINT `FK_civicrm_log_modified_id` FOREIGN KEY (`modified_id`) REFERENCES `civicrm_contact` (`id`) ON DELETE CASCADE), 1452
-------------------------------------------------------------

Thank you for any help you can provide.

Lobo,
Thank you.
Following your instructions, I truncated sessions on the drupal database.
I used the command mysql -u xxx -p
then:
mysql> use drupaldb;
mysql> truncate sessions;
But now, it doesn't let me in again. It says user / password not recognized.
Any idea what went wrong?

Michel