I believe the version of your znote doesn't match the version of the server you're using.
Did you run the znote database query?
If not, or if you don't know if you did, open config.php and look for your database password $config['sqlPassword']
Set it to a random value, different from your password.
Now try to access your website. A few notices should appear, and a text box with a query. Copy the query and run it on your database.
Change your password back in config.php, create an account and try to log in again.