Fatal error: Uncaught TypeError: join(): Argument #1 ($array) must be of type array, string given in /Users/hisaom/Sites/HMwiki/plugin/backup.inc.php:101 Stack trace: #0 /Users/hisaom/Sites/HMwiki/plugin/backup.inc.php(101): join('', NULL) #1 /Users/hisaom/Sites/HMwiki/lib/plugin.php(108): plugin_backup_action() #2 /Users/hisaom/Sites/HMwiki/lib/pukiwiki.php(69): do_plugin_action('backup') #3 /Users/hisaom/Sites/HMwiki/index.php(23): require('/Users/hisaom/S...') #4 {main} thrown in /Users/hisaom/Sites/HMwiki/plugin/backup.inc.php on line 101