The "Error occurred while reading files" error will be brought up every time your game client reads a file that has been corrupted. In order to resolve this problem, simply perform a file repair.
- Open your Black Desert Online Launcher.
- Click the cogwheel located on the top right corner of the Launcher window.
- Next to "Repair Mode", click the "Click to start" button, and select "Yes" to initiate a file repair.
In case the button is grayed out for you, you can force the Launcher to repair by navigating to your installation directory and deleting the version.dat file located there.
If you are using Steam, use these instructions instead: