Lost Ark - Fix Error 105: Corrupted Data Found
On this window, in the local files tab, select Verify integrity of game files. This will take a minute to redownload and replace any missing or corrupted game files.
Lost Ark Launch Option
In the General tab, you can use Launch Options, which are commands executed when you launch the game. Use the launch option:
-fullscreen
This will force Lost Ark to launch in fullscreen mode which has helped fix the error for some players.
Task Manager
In case the issue persists, then make sure to disable any application overlays which could show up when playing the game. Open up your Task Manager by searching for it in your start menu search.
Here, in the Processes tab, make sure to end the processes which could show an overlay, such as Discord or other applications running on your system. You should also prevent application from running which could change your game files, such as CCleaner or your anti-virus application.
Windows Update
Next, close your Task Manager and open up your system settings.
In the Windows Update tab, make sure that you are running the latest Windows version on your PC.
Repair EasyAntiCheat
Lastly, you should repair your EasyAntiCheat program.
Open up your File Explorer. Navigate to the drive on which you saved the game on, Program Files > Steam > steamapps > common > Lost Ark > Binaries > Win64 > EasyAntiCheat. Double-click the EasyAntiCheat setup application.
On this window, select Repair Service. This will take a second to make sure that EasyAntiCheat is working properly, which could otherwise result in the Corrupted Data Found error you are getting.
