Dynamic URLS ‘not found’

Try to set your permalinks to “post name”:

https://s3.amazonaws.com/f.cl.ly/items/213V0Y2e1v312f003d1F/Image%202015-09-17%20at%2011.28.17%20AM.png

As you can see in the image, the default setting will give you a non-pretty permalink, like yours above.

Thanks for your reply.

I have just checked my permalinks and it is already set at “post name”.