iam error in installing OJS
localhost is currently unable to handle this request. HTTP ERROR 500
here is my error log
can anyone help me?
[Sat May 09 20:44:05.579495 2020] [php7:warn] [pid 8040:tid 1932] [client ::1:57718] PHP Warning: Declaration of InstallHandler::validate($request) should be compatible with PKPHandler::validate($requiredContexts = NULL, $request = NULL) in C:\xampp\htdocs\JHEI\lib\pkp\pages\install\InstallHandler.inc.php on line 48
[Sat May 09 20:44:08.076092 2020] [php7:warn] [pid 8040:tid 1932] [client ::1:57718] PHP Warning: count(): Parameter must be an array or an object that implements Countable in C:\xampp\htdocs\JHEI\cache\t_compile\e8ea13aa559bf8604ca823015b397a28d8666486^28682bb3d6b6e750ebd3d458abc8f92b4da9ea9f_0.app.headerusernav.tpl.php on line 136, referer: http://localhost/jhei/index.php/index/install/install
[Sat May 09 20:46:31.641707 2020] [php7:warn] [pid 8040:tid 1936] [client ::1:57733] PHP Warning: Declaration of InstallHandler::validate($request) should be compatible with PKPHandler::validate($requiredContexts = NULL, $request = NULL) in C:\xampp\htdocs\JHEI\lib\pkp\pages\install\InstallHandler.inc.php on line 48, referer: http://localhost/jhei/index.php/index/install/install
[Sat May 09 20:46:31.978499 2020] [php7:error] [pid 8040:tid 1936] [client ::1:57733] PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\JHEI\lib\pkp\lib\adodb\drivers\adodb-mysql.inc.php:456\nStack trace:\n#0 C:\xampp\htdocs\JHEI\lib\pkp\lib\adodb\adodb.inc.php(558): ADODB_mysql->_connect(‘localhost’, ‘root’, ‘’, ‘’)\n#1 C:\xampp\htdocs\JHEI\lib\pkp\classes\db\DBConnection.inc.php(151): ADOConnection->Connect(‘localhost’, ‘root’, ‘’, NULL, false)\n#2 C:\xampp\htdocs\JHEI\lib\pkp\classes\db\DBConnection.inc.php(126): DBConnection->connect()\n#3 C:\xampp\htdocs\JHEI\lib\pkp\classes\db\DBConnection.inc.php(113): DBConnection->initConn()\n#4 C:\xampp\htdocs\JHEI\lib\pkp\classes\db\DBConnection.inc.php(55): DBConnection->initCustomDBConnection(‘mysql’, ‘localhost’, ‘root’, ‘’, NULL, false, ‘utf8’)\n#5 C:\xampp\htdocs\JHEI\lib\pkp\classes\install\PKPInstall.inc.php(76): DBConnection->__construct(‘mysql’, ‘localhost’, ‘root’, ‘’, NULL, false, ‘utf8’)\n#6 C:\xampp\htdocs\JHEI\lib\pkp\classes\install\Installer.inc.php(178): PKPInstall->preInstall()\n#7 C:\xampp\htdocs\JHEI\lib\pkp\cl in C:\xampp\htdocs\JHEI\lib\pkp\lib\adodb\drivers\adodb-mysql.inc.php on line 456, referer: http://localhost/jhei/index.php/index/install/install