You recieve the error message "Error while importing Microsoft Deployment Toolkit Task Sequence. Details: The network name cannot be found" when going through the MDT 2010 Configuration Manager Quick Start

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Turns out permissions are missing.

For each share the document requests you make, you need to add NT AuthoritySystem with Read/Write permissions (Package$ in particular). Found this out through the comments on the deployment guys site (which the original post was to videos you might find interesting)

https://blogs.technet.com/deploymentguys/archive/2008/03/20/sccm-2007-and-microsoft-deployment-toolkit-video-walkthrough.aspx

Hope this helps!