Error message

Notice: unserialize(): Error at offset 11 of 31 bytes in variable_initialize() (line 1189 of /var/www/vhosts/ginosgiant.com/httpdocs/includes/bootstrap.inc).
The requested page "/sites/default/files/styles/large/public/Untitled47.png?itok=rR9FZfIH" could not be found.