You're attempting to turn on a failed add-on so it's probably resetting your add-on list. Though even then build rules should shut off. Delete it if it causes that much of a problem.
As for CityRP. Delete it. It doesn't work properly and even if it did, no one likes it. Well aside from those who lack creativity and stuff their server with 30 different kinds of machine guns.
For the invalid packet, try disabling some prints.