Ran into some problem after I had migrated a SCCM 2007 site to SCCM 2012 SP1
When running the Task Sequence I got the following errors in SMSTS.LOG
Empty location for package: _SMSTSP01000F1 ApplyOperatingSystem
Installation of image 1 in package P01000F1 failed to complete..
The system cannot find the file specified. (Error: 80070002; Source: Windows) ApplyOperatingSystem
The resolution was to change the deployment properties on the Task Sequence from "Access content directly from a distribution Point" to "Download content locally".
I Believe that changing the operating system package properties under Data Access to "Copy the content in this package to a package share on distribution Points" would have been the other solution to this problem.