Field ‘post_edit_reason’ does not have a default value 
Field ‘topic_last_poster_name’ does not have a default value 
or other similar
The transition from MySQL 4 to MySQL 5
1. Create a new database,
2. Install it again phpBB3,
3. In the old phpBB3 by ACP export the same data,
4. Import them to the new database.