Ok so two things with that error:
1. Have you confirmed your create image task did successfully create the package on the local site server your client resides? When I mean confirmed, you actually see the .mac package it makes on the site server? The exact file path of the source should be listed in your deploy job.
2. Have you made sure in Site Server settings - > Package Service settings that you have "Publish UNC Codebases" enabled?
A recommendation if all of my suggestions check out is to turn on verbose logging on your NetBooted client before you push the job. See below article for verbose logging for mac clients, once you have the logs, post them up after you try your push.
http://www.symantec.com/business/support/index?page=content&id=HOWTO7073&actp=search&viewlocale=en_US&searchid=1424969416533