Why cant Google access my robots.txt ?????

I simply cannot understand why Google is not being able to access my robots.txt file.
Here it is :
http://ift.tt/1LeJtT6

I am getting the following error message on Webmaster Tools : Crawl postponed because robots.txt was inaccessible. But when I try the fetch as Google option on Webmaster Tools, i sometimes get a success and sometimes get a "temporarily unreachable" message.

My hosting provider says everything is just perfectly fine.

Help please !!

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