In a way, Error kind of has his own gravity that lets him stick to a surface, or simply come back down without the need of natural gravity. So, he would just be able to jump much higher than usual instead of float around, doesn't matter if there's zero gravity. If there's something he could stick to, he'll be able to latch onto it. A reason you shouldn't fight him in deep space.

He easily travels from one surface to another and can be nearly unbeatable in a cluster of astroids. The only one capable of besting him is his mentor, 404, and that fight could possibly take a year.