Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /volume1/web/et/class/database/DB.php on line 28

Fatal error: Uncaught Error: Call to undefined function mysql_fetch_array() in /volume1/web/jendo/communicationBook/checkTbl.php:13
Stack trace:
#0 {main}
  thrown in /volume1/web/jendo/communicationBook/checkTbl.php on line 13