SSH syntax with Unison

[tradclimber14]

I am a very new user to the Ubuntu world and am trying to configure Unison between a Windows 7 machine and Ubuntu 12.04.

I have successfully ran a local backup job from the Windows 7 side (as a test)  and for my next test I have been trying to initiate contact from the Windows 7 side( unison software via ssh) to the Ubuntu machine. However every time I try I get this error message:

"Fatal Error"
Error in starting shell connection:
No such file or directory [create_process(ssh)]

I have tried every trick within my limited understanding of ssh and unison and am guessing there is a syntax error.  Please have a look at my unison configuration file below.

# Unison preferences
root = ssh://scott@192.168.1.50//samba/share/scott_files
root = D:\

# Place new files at the top of the list
sortnewfirst = true

#Don't synchronize permission bits
perms = 0

#ignore these files

ignore = Name Thumbs.db
ignore = Name Desktop.ini



I am struggling with the documentation and have not been able to find any other good examples. So I am very stuck...