Website is not responding and editor disappeared

[0zz]

Hello again! I found this old topic because I've faced similar problem again - the editor is not loading, only page title and option are showing.

The debug mode shows following error:

Warning: simplexml_load_string(): Entity: line 299: parser error : CData section not finished <table border="0" cellpadding="0 in /var/www/vhosts/../httpdocs/admin/inc/caching_functions.php on line 283

Warning: simplexml_load_string(): Entity: line 299: parser error : Premature end of data in tag content line 2 in /var/www/vhosts/../httpdocs/admin/inc/caching_functions.php on line 283

Warning: simplexml_load_string(): Entity: line 299: parser error : Premature end of data in tag item line 2 in /var/www/vhosts/../httpdocs/admin/inc/caching_functions.php on line 283

What does this mean?