This error means that some files are broken or missing.
Note that the majority of cracks remove multiplayer/online files since it cannot be used in the first place so it might be what's happening here.
We only support files given in our install doc.
Either buy the game on Steam or use our torrent.
https://plutonium.pw/docs/install/
You can also try to repair your broken files but it's not really recommended although it might work and again we won't help with this
https://plutonium.pw/docs/repair/