[Plugin: SidePosts Widget] Full post not showing – 404 message received

I’ve just installed Sidepost 1.5.1 and found it very easy to set up. But I must have done something wrong because although I can see my SidePost when I click on the Read More I get a 404 File Not Found message.

Please help! http://www.nextstop-geneva.com/

~C.

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