That error is likely because the mysql server isn't actually running.
It seems like the application to 'start' mysql with OSXServer needs some tweaking of its settings to get started.
If I remember correctly, the tables may not be properly populated. You can find the log file to give you a clue as to what is happening.
Open Terminal and look at your log files. It is located in /var/mysql
Then look for the file named with an ending '.err'
Type 'tail [filename].err" and it should list the last 10 lines of the log for you to see. Perhaps this can get you started in the right direction.
If you get an error like the following, it is likely your tables and permissions are not set for the database:
"/usr/libexec/mysqld: Can't find file: './mysql/host.frm' (errno: 13)"
Good luck.