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I've had a look at the page and like Martijn said it seems fine to me. I also crawled it as Google bot user agent and it returned a correct 200 status. It could perhaps be a temporary server issue and the page/site is going down intermediately? You could check your server logs to see if there has been any issues? You could also try a free up time checker such as one of these: 10 Free Services to Monitor Your Site's Uptime. If the error keeps happening and the page isn't actually going down, might be best to raise the question on Google's support forums; unless of course someone comes along here with the answer!

Hi Robert, Sorry for the late response. I took at peek at your campaign and couldn't spot any issues. Hopefully you're not having trouble anymore, but if you spot any irregularities please let us know! Cheers, Cyrus

Take a look at the Moz Help Page Why Isn’t My Site Being Crawled? You're Not Crawling All My Pages! It lists the most common reasons for your issue.

thanks guys

Hi Robert, any updates?