I managed to get the following error the other day while helping migrate and upgrade some MySQL databases for a client.
mysqldump: Got error: 1356: View 'database.table' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them when using LOCK TABLES
The above appeared anytime I tried to dump the database to a SQL file using mysqldump. Its actually one of the better errors I have seen come out of MySQL (which has pretty terrible error reporting most of the time) and tells you exactly what is going wrong. Essentially there is a old view in the the database that should be removed since its no longer valid and is throwing a compile exception.
Of course this isn’t useful most of the time and the workaround is to add the force command -f into the mysqldump command. This forces the database to dump everything anyway which is perfect for automated backups.