AX 2012 R3 Contoso data

Hello,

I am trying to import the Contoso sample data in AX 2012 R3, according to the procedure described here:

https://community.dynamics.com/ax/b/thedynamicsblog/archive/2014/05/13/ax2012-r3-how-to-import-contoso-data-using-test-data-transfer-tool-beta.aspx

After the execution of the command 

DP.exe IMPORT "D:\MicrosoftDynamicsAXR3DemoData" <database name>  <sql server name> \ <sql server instance>

I have: "Remaining: 0, errors: 5738"

In the log file there are many errors of this kind:

System.Data.SqlClient.SqlException (0x80131904): Cannot bulk load because the file "\\<machine name>\C$\Users\<my user>\AppData\Local\Temp\bfsyq42q.uda" could not be opened. Operating system error code 5(Access is denied.).

I have veryfied that Administrator (that runs the command) has full control on the directory mentioned in the error.

I would be very grateful for any ideas that could help me solve this issue.

Best regards,

Agostino