How to remove MLPI BOT hack?
Cause
MLPI bot hack (Mojang Loss Prevention) exploits a vulnerability in non-premium servers, where player accounts are not verified in the Minecraft database.

How to remove/fix the server?
- Turn off the server.
- Go to the
/world/data/directory and delete theraids.datandrandom_sequences.datfiles. - Turn on the server.
How to protect yourself?
Enable online-mode or create a whitelist. You can create a whitelist in the panel in the Players -> Whitelist tab.