I ran into a strange error, I want to share it with you.
I had to convert my MySQL database to SQLite, which was actually a piece of cake with the program called DBConvert.
So I changed in my application.ini:
resources.db.adapter = "PDO_SQLITE"
resources.db.params.dbname = APPLICATION_PATH "/../data/db/db_name.db"
And try to show my website, everything looks correct. Except when I try to login to my website, it gives the following error: The supplied parameters to Zend_Auth_Adapter_DbTable failed to produce a valid sql statement, please check table and column names for validity.