Product Page & Cart Not Available

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I have a fresh joom install and configured a couple of products, categories etc. Added some menu items configured to the cart, shop category etc but when I select the product details I get The website encountered an error while retrieving http://blah.com/index.php/details. It may be down for maintenance or configured incorrectly. and when I select the cart I get a similar message.

I have tried the products detail page setting at all of the options ,  and also tried changing the Shopfront Settings (template)

Have I miss something else where? Any suggestion to solving this?

Thanks in advance,

James