You cannot run this command line utility from a network location. To register Windows Server Migration Tools, copy the deployment ...

You cannot run this command line utility from a network location. 
To register Windows Server Migration Tools, copy the deployment folder to a local drive on the source computer that is running Windows Server 2008, Windows Server 2008 R2 or Windows Server 2003, and run this command again.
To create a deployment folder for computers that are running Windows Server 2003, Windows Server 2008 or Windows Server 2008 R2, install Windows Server Migration Tools on Windows Server 2012, and use the command line utility located at %Windir%\System32\ServerMigrationTools\SmigDeploy.exe.
For more information, see the Windows Server Migration Tool Installation, Access and Removal guide online.