You need repair your wallet 
how? is there any tools i can use to repair it
try renaming wallet, to see if it works without it.. if so, wallet corrupted, use a backup and remember never to force close the client.
its work with new wallet, but i got no backup of it. is there anything i can do to repair it?
you can use pywallet to extract your privkeys
you will need to check a guide how to use it as i have never used.
you need to set some switch so it can read the format- like you do with using namecoin with pywallet - i think
https://github.com/jackjack-jj/pywallet need to select the right value in "otherversion"
If get stuck let me know and i'll find out
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Once we implement "the Cleansing" (disaster) the game (human mining) i think will be much more fun.
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We are also progressing well with centralized server (a service) and alternate game client, which will allow playing on any device in browser, android and iOS.
Probably we can work with Mithril Man to use the server with his client.. although when we implement pruning of the chain (after each disaster), it may not even be necessary.