Got latest version ... 0.5.9 ... still getting this:

(13:56:42) | Error while compiling ServerInfo: No overload for method 'ToString' takes 1 arguments | Line: 114, Pos: 77

Here is line 114...

.Any(group => Permission.UserHasGroup(player.userID.ToString(), group))).ToList();

Also getting this when I click on the on-screen INFO button...

(14:11:16) | Failed to call hook 'ShowConsoleInfo' on plugin 'ServerInfo v0.5.9' (ArgumentNullException: Value cannot be null.