Portfolio 404 errors

Hi Guys, loving the theme by the way.

I seem to be having a problem with the portfolio. The items show on the cube on the home page, however, when i click on one of them i just get a 404 error. Am i missing something?

Even when i’m editing the portfolio item in the admin panel and follow the link from there, i still get a 404. I’m baffled but no doubt it’s just something simple.

Jamie