I need some help with the following:

I run a Dell laptop with windows 7, dual screen. Also with VMware Workstation 8 and on that Ubuntu 12.04. I also use a Freecom NAS in my network (for backups etc.) If I try to access the NAS, going to home folde>browse network it detects the NAS. However clicking it I get the following response:

"Unable to mount location
Failed to retrieve share list from server".

Since I am quite new to Ubuntu, can any one tell me what might cause this and how to get it to work and access the shares on that NAS?

THNX in advance..