What I remeber about these files (marines/grenades) its just show up in the logs of server, but I don't know why and never was a problem for me.
What's showing up for who are trying join in the server, and what is the log in …
Same problem here.
1) delete all files in the server (appdata and the game);
2) desactivate all mods in the server;
3) delete my files and unsubscrib the mods.
My final log when i receive the message …