That looks to me like your host is down, contact them.
ohh
my host is x10hosting.com
where do ireport it?
can you suggest the best free webhosting
I would suggest you find some more reliable (and paid) hosting as x10hosting has had some issues with MyBB in the past and don't have an great reputation, plus their uptime obviously isn't great either.
can you suggest some free webhosting better than x10hosting.com?
I have said this in other threads as well but I don't recommend free hosting at all, its not worth the hassle and complications when you can get hosting that causes you none of this for $5 per month.
This thread might be of use to you though:
http://community.mybboard.net/thread-30827.html