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Here are some of the common reasons at https://seomoz.zendesk.com/entries/409821-why-isn-t-my-site-being-crawled-you-re-not-crawling-all-my-pages. If that doesn't fix things, send an email to help@seomoz.org. Thanks!

If you have two pages on the same topic that are essentially duplicates I would 301 redirect the weaker one to the stronger. If you have two short articles on the same topic that could be combined into one longer article with more complete coverage of the topic I would combine the content on the stronger URL and 301 redirect the weaker. If these are two distinctly different articles in the same topic area that would not be logically combined then I would keep both of them "as is". My goal in small niches is to SATURATE the keyword spaces with lots of unique, substantive articles so that I keyword cannibalize everywhere. Being called a "cannibal" can be a compliment.   Yoummmm!

ok thanks for your help!

Ideally you should remove one and 301 redirect it to the other. If you need to keep both pages on your site, then definitely use the canonical tag. As an aside, I'd also configure your server to fix your URLs and remove the capital letters - configure your htaccess file on your apache server to automatically redirect capital letters to lowercase, thereby avoiding further canonical issues. See here for more info - http://www.stateofsearch.com/three-htaccess-tips-for-seo/