[Plugin: Xpost] File does not exist: /var/www/blogname/crossdomain.xml

I am seeing the following in my error.log file – which I assume is related to the error I get when trying to upload by xpost settings:

File does not exist: /var/www/blogname/crossdomain.xml

Any ideas?

Thanks in advance, Jay

http://wordpress.org/extend/plugins/xpost/