So I am currently in a minecraft singleplayer world 1.8.9 have also tried 1.9 and I have created a hologram using a command block and some code. Early today I was using this command /minecraft:kill @e[type=armor_stand]and it would instantly remove the hologram of text. For some reason hours later it does not work, error by minecraft unknown command. If you have a suggestion or know why this might be happening please respond. It is driving me insane. Thank you!!