Fatal error: Uncaught Error: Call to undefined function is_blog_installed() in /usr/home/biloubar.com/web/wp-includes/load.php:664
Stack trace:
#0 /usr/home/biloubar.com/web/wp-settings.php(159): wp_not_installed()
#1 /usr/home/biloubar.com/web/wp-config.php(91): require_once('/usr/home/bilou...')
#2 /usr/home/biloubar.com/web/wp-load.php(37): require_once('/usr/home/bilou...')
#3 /usr/home/biloubar.com/web/wp-blog-header.php(13): require_once('/usr/home/bilou...')
#4 /usr/home/biloubar.com/web/index.php(17): require('/usr/home/bilou...')
#5 {main}
  thrown in /usr/home/biloubar.com/web/wp-includes/load.php on line 664

Fatal error: Uncaught Error: Call to undefined function get_option() in /usr/home/biloubar.com/web/wp-includes/l10n.php:69
Stack trace:
#0 /usr/home/biloubar.com/web/wp-includes/l10n.php(137): get_locale()
#1 /usr/home/biloubar.com/web/wp-includes/l10n.php(828): determine_locale()
#2 /usr/home/biloubar.com/web/wp-includes/class-wp-fatal-error-handler.php(46): load_default_textdomain()
#3 [internal function]: WP_Fatal_Error_Handler->handle()
#4 {main}
  thrown in /usr/home/biloubar.com/web/wp-includes/l10n.php on line 69