First, check that you have correctly installed the patches.
You should have the "/installation" directory restored in the master website.
Do you have the "Symbolic Links" functionality avaialble.
Check with video 4 to 7
If symbolic link is OK, verify that you deployed the website into a specific directory.
The path depend of your domain URL.
Use for example the video 9 procedure
www.jms2win.com/en/tutorial/259
Sample values:
* Site ID = slave1
* Domain name = {site_url}/multisites/{site_id}
* Deploy directory = {site_dir}
Verify that you have the symbolic links created and that the "/installation" directory contain something.