OS X Yosemite 10.10.3 .plist can't be found
Nothing is wrong! In Recovery Mode you can't simply access your common users since the Mac is booted to a special recovery image which doesn't contain your familiar accounts except a root user.

To access your common users you first have to unlock and mount the FileVault2 volume and then you can find the hashes at:

/Volumes/&lt;Volume_name&gt;/var/db/dslocal/nodes/Default/users/&lt;user&gt;.plist