Fatal error: Class 'mysqli' not found in /home/davewill/phpinclude/phoenix1609/phoenix_mysqldatabase.cls on line 239

Fatal Error:Class 'mysqli' not found; at /home/davewill/phpinclude/phoenix1609/phoenix_mysqldatabase.cls+239, /home/davewill/phpinclude/phoenix1609/phoenix_core.cls+1128, PhoenixCore::Shutdown()