It clearly says in bold red writing.....
YOU WILL BE BANNED IF YOU HAVE PRINTERS, DRUGS, URANIUM, OR ANYTHING WORTHY OF RAID IN YOUR BASE WHILST HAVING A BUILDING SIGN. TAKE IT DOWN BEFORE YOU SPAWN YOUR ENTITIES.
Your lucky it wasn't longer. And you can survive 24 hours, just take that time to Re-Read the rules linked below.
Click me for Rules!