Whenever I launch my map I get these errors:

http://imgur.com/c9BS2qo

I've also noticed that when I look around it's a bit skippy. Any solutions?

this error is for the absence of volumes and zombies taget to it , you should place some zombies spawn and  areas and the red string ill be green anyway is a not an error but a notification of the volumes in your map ,
( Volumes need to spawn the zombie favors the position of the player tries to see one of the many guides on yt on how to Set the spawn )
I hope Essert helpful Been good luck 
sorry 4 bad eng