error.log'daki hata bu şekilde çözümünü bilen yardımcı olabilir mi?

[28-Dec-2023 19:44:02 Europe/Istanbul] PHP Fatal error: Uncaught Error: Call to undefined function json_encode() in /home/karvelcom/public_html/wp-includes/functions.php:4195
Stack trace:
#0 /home/karvelcom/public_html/wp-includes/functions.php(3941): wp_json_encode(Array)
#1 /home/karvelcom/public_html/wp-includes/functions.php(3661): _json_wp_die_handler('PHP kurulumunuz...', 'Gereksinimler s...', Array)
#2 /home/karvelcom/public_html/wp-includes/load.php(168): wp_die('PHP kurulumunuz...', 'Gereksinimler s...', Array)
#3 /home/karvelcom/public_html/wp-settings.php(37): wp_check_php_mysql_versions()
#4 /home/karvelcom/public_html/wp-config.php(92): require_once('/home/karvelcom...')
#5 /home/karvelcom/public_html/wp-load.php(50): require_once('/home/karvelcom...')
#6 /home/karvelcom/public_html/wp-blog-header.php(13): require_once('/home/karvelcom...')
#7 /home/karvelcom/public_html/index.php(5): require('/home/karvelcom...')
#8 {main}
thrown in /home/karvelcom/public_html/wp-includes/functions.php on line 4195