Deprecated: version_compare(): Passing null to parameter #2 ($version2) of type string is deprecated in /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-content/plugins/elementor/core/upgrade/manager.php on line 62

Fatal error: Uncaught TypeError: fwrite(): Argument #1 ($stream) must be of type resource, bool given in /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-content/plugins/wp-file-manager/file_folder_manager.php:70
Stack trace:
#0 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-content/plugins/wp-file-manager/file_folder_manager.php(70): fwrite()
#1 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-includes/class-wp-hook.php(308): mk_file_folder_manager->create_auto_directory()
#2 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#3 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-includes/plugin.php(517): WP_Hook->do_action()
#4 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-settings.php(623): do_action()
#5 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-config.php(88): require_once('/var/www/vhosts...')
#6 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-load.php(50): require_once('/var/www/vhosts...')
#7 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-blog-header.php(13): require_once('/var/www/vhosts...')
#8 /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/index.php(17): require('/var/www/vhosts...')
#9 {main}
  thrown in /var/www/vhosts/dataknowledgeacademy.nl/webspace/httpdocs/dataknowledgeacademy.nl-wordpress/wp-content/plugins/wp-file-manager/file_folder_manager.php on line 70