I was briefly taken aback when I first noticed these apparently contradictory signs. Then I figured out what was going on. I’ve deliberately organized the composition to hide the true situation, which is that there’s another road going off to the left (out of the picture). The two roads are part of a one way system. The ‘no entry’ sign refers to the road to the left. The ‘exit’ sign refers (as the arrow indicates) to the road on the right. Pretty obvious really but at first glance I didn’t notice this.