The issue is not necessarily an issue with AdminStudio’s Repackager. It actually most likely has nothing to do with the Repackager. It is probably that your image does have pending file operations.
All you should need to do is restart the PC, twice, before you do anything, meaning boot it; when finished booting down it. Boot it one more time. Then start the Repackager.
If this is an annoyance then you might think about switching to VMWare for Repackaging projects. And not repackaging on an actual PC. This will usually eliminate the issue altogether.
Once this is done any pending file operations should be complete and the Repackager should run normally.
This is common with Ghosted images. They are doing last minute configs to the PC they were Ghosted to. Things like drivers or profile modifications or even hardware modifications.
Let me know what happens if you do this.
Thank you,
Bill V.