MS-Word: There has been a network or file permission error

Hi friends,
I am consulting here an error I meet while using Microsoft Word in the office over a network file server, I had a problem saving my file to the server, I received an error message that goes There has been a network of file permission error. The network connection may be lost.
There has been a network or file permission error. The network connection may be lost
The error message above is suggesting for a network connection problem, I already check my connection toward the server and its been up and running, when I tried other files I can save it, only this file has a problem.
Please share some ideas on this scenarios, thanks.
