SQLSTATE[08004] [1040] Too many connections

Notice: Undefined variable: link in /var/www/html/includes/classes/clsDatabase.php on line 120

Fatal error: Uncaught Error: Call to a member function query() on null in /var/www/html/includes/classes/clsDatabase.php:120 Stack trace: #0 /var/www/html/includes/classes/clsDatabase.php(16): clsDatabase->dbExecuteQuery('SELECT * FROM c...', 'USERS') #1 /var/www/html/includes/classes/clsCredits.php(29): clsDatabase->dbGetResult('USERS', 'SELECT * FROM c...') #2 /var/www/html/login.php(7): clsCredits->get_credit_packages() #3 {main} thrown in /var/www/html/includes/classes/clsDatabase.php on line 120