Try on a different computer if you can. The coins are stored on the blockchain, wallet.dat just proves you control those addresses
Short of that, try googling it. I'm sure someone else has had this issue, and as I'm unable to reproduce the error, I can't offer much more advice
Wow I really don't understand wtf happened... I asked you last week about resetting coins... You say just make a address and send it and than send it back... That's why I try it.. Now it fucked up. I should have just send it to bittrex
Things can happen on computers at any time for 1000 different reasons. Some of the outcome could be corruption and most of the time it is local issues. It can be dev issues but mostly it is local. Good practice is to make backups of wallet.dat files and every time you create a new address in your wallet make a backup. I would recommend the following steps:
1) Close the wallet
2) Make a backup of your existing wallet.dat file that have the issues to a USB stick or to another place on your hard drive
3) Rename your \user\username\AppData\Roaming\10k folder to 10k.old
4) Re-download the 10k v2.0.2 wallet and let it download the block chain.
5) Rename the wallet.dat in the new 10k directory to wallet.old (this step is not really necessary)
6) Copy the wallet.dat file that you backed up in step 2 to the new 10k folder
7) Open the wallet and see if the error is gone
8.) If you get this far and the error is gone then great and you are back in business. If not then it means that your wallet.dat file might be corrupt. If this is the case then if you followed good practice you should have a backup of the wallet.dat file somewhere after you created your second address or the address that you sent the coins to. Take that backup and restore it to your new 10k folder and all should be ok.
Golden rule:
You never ever ever ever ever send coins to another address in your wallet without making a backup of the wallet.dat first after you created the new address and before sending the coins. Personally, I recommend sending to another wallet on a different computer but have used a 2nd address in wallet with no issues.
Prognosis:
If you get an error in step 4 then you have other issues on your computer that you need to trouble shoot. If you get an error in step 7 then your wallet.dat file is corrupt and requires a restore from a backup. Since corruption on a PC can happen at any time on any file from any application, it is good personal practice to make backups of critical files to cover yourself. If the outcome of this is that your wallet.dat file is corrupt and your coins lost, and you do not have a backup to restore from, then it is your own fault unfortunately.
cuz i transfer 8bil coin at one time.. it fuck up my wallet.dat ..... i delete eveything and now works .. but how do i get back my coins?
Too bad it's probably impossible to make this the official tipping coin of Facebook.