The worst has happened, and your files became corrupted. At times, this is easily resolved by repairing your game files, although in a lot of cases, constant "The file is corrupted" errors even after repairs can be an indication towards faulty hardware - highly likely with your RAM modules.
This happens when game assets are loaded from your storage device into corrupted RAM sectors, and as the client is trying to load them, the error occurs. While not as easily identifiable in other applications, the amount of game assets Black Desert Online has is huge, and the chances data is loaded in a bad sector are considerably high.
For this, we recommend Memtest86, a memory checking tool that will scan your RAM modules for underlying issues - it is worth noting that Windows Memory Diagnostic will not provide solid results). If any errors are found after a complete scan, a RAM replacement is highly suggested.