If you took those monsters from otserverbr pack which I guess you did you get that error when using tfs 1.2. Easy fix is to open the monster file and remove those flags to remove the error. Without knowing 100% I think it's because those flags are used in tfs 1.3 wich otserverbr is based on. I assume your using tfs 1.2 and it can't recognize those flags. Someone will have to confirm that. I assume there is an equivalent flag in 1.2 but you would have to check.