Fatal error: Call to undefined function json_encode()

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Hello everyone, I have no idea what to do and I really need help. My wordpress website works perfectly on localhost, but once i set it up on a real hosting i started getting this error:
`Fatal error: Uncaught Error: Call to undefined function json_encode() in /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/functions.php:4247 Stack trace: #0 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/widgets/class-wp-widget-text.php(59): wp_json_encode(‘text’) #1 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/class-wp-widget.php(274): WP_Widget_Text->_register_one() #2 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/class-wp-widget-factory.php(102): WP_Widget->_register() #3 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/class-wp-hook.php(307): WP_Widget_Factory->_register_widgets(”) #4 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array) #5 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/plugin.php(476): WP_Hook->do_action(Array) #6 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/widgets.php(1854): do_action(‘widgets_init’) #7 /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/class-wp-hook.php(307): wp_widgets_init(”) #8 /var/www/vhosts/mywebsite.com/httpd in /var/www/vhosts/mywebsite.com/httpdocs/wp-includes/functions.php on line 4247`

Does anybody have any idea what’s going on? What should i do?

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