Most often this error can be resolved by just removing the WDB folder that is inside the World of Warcraft folder. Rename or delete that folder and try to run World of Warcraft again. If the above did not resolve the problem, please close down World of Warcraft and remove the WTF, WDB and Interface folders from the World of Warcraft game directory. These folders contain temporary data and custom UI's. You can move these folders to the desktop or another directory if you wish to retain the data, however for now please start World of Warcraft without those folders present. Also do not use any third party programs to start World of Warcraft; often some custom UI's will place a shortcut for you to start World of Warcraft from, please use the (Launcher.exe) in the World of Warcraft directory.
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