smb_relay vulnerability

As a class assignment, I have attempted to break into windows XP SP2 using smb_relay module in metasploit.

I have launched the exploit and enter the attacking server. however, the shell shows the following message.

[-] Failed to authenticate as EVANPARK603A\Administrator...

Can anyone help?

Here is the tutorial video that I have followed http://ift.tt/1zG0e20