[HELP !!! ]Google can't crawl my website !!

Google just messaged me they told me that they can't access to my robots.txt i did a fetch as googlebot and it fails to fetch it, i tried homepage and it also the same problem i have Joomla, it was running for 2 months !! no problem !!
please can you help me ??!!

SORRY Mods !!! i don't how but i just refresh webmaster tools page i did fetch as googlebot again and it worked !!! sorry !!!