Warning: mysql_pconnect(): No such file or directory in /volume1/web/teacher/class/database/pdb/drivers/pdbmysqldriver.class.php on line 103

Warning: mysql_error() expects parameter 1 to be resource, boolean given in /volume1/web/teacher/class/database/pdb/drivers/pdbmysqldriver.class.php on line 133

Fatal error: Uncaught exception 'Exception' with message 'Fatal error: could not connect to the database! Error: ' in /volume1/web/teacher/class/database/db.class.php:76
Stack trace:
#0 /volume1/web/teacher/class/config/configdbstorage.class.php(83): Db->getDb()
#1 /volume1/web/teacher/class/config/configdbstorage.class.php(63): ConfigDbStorage->_initializeDatabase()
#2 /volume1/web/teacher/class/config/configdbstorage.class.php(56): ConfigDbStorage->_loadAllValuesFromDatabase()
#3 /volume1/web/teacher/class/config/config.class.php(103): ConfigDbStorage->ConfigDbStorage(NULL)
#4 /volume1/web/teacher/plugins/badbehavior/index.inc.php(122): Config::getConfig()
#5 /volume1/web/teacher/plugins/badbehavior/index.inc.php(171): bb2_read_settings()
#6 /volume1/web/teacher/plugins/badbehavior/index.inc.php(198): bb2_install()
#7 /volume1/web/teacher/class/object/loader.class.php(7): include('/volume1/web/te...')
#8 /volume1/web/teacher/index.php(29): lt_include('/volume1/web/te...')
#9 {main}
  thrown in /volume1/web/teacher/class/database/db.class.php on line 76