Website is not responding and editor disappeared

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Debug mode on?

Yes, I've mentioned above. There are mistakes related to caching, but no sure:

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