File sharing through samba is not working over LAN
Solution 1:
The directory /var/lib/samba/usershares is set up so only root or members of the sambashare group can read or write to it.
drwxrwx--T 2 root sambashare 4096 Mar 25 2012 usershares
That you can't access it (try it by cding to it) suggests to me that you're not in the sambashare group. You can test this with id $USER and assuming usershares is not in the output, you can fix all this just by running:
sudo usermod -a -G sambashare $USER
If you still get error 255 after adding the particular user to the group you might need to reboot.