A family of Microsoft relational database management systems designed for ease of use.
Nalwi,
What version of Project are you using? And is it a standalone version or network based (e.g. Project Server or Project Online)?
If you are using a standalone version of Project (i.e. resident on your PC), I can't think of any reason why you would get a network error. However, if are using a network based version of Project, then indeed there could be a problem with the network connection to Project. It may just be a temporary glitch or it may be a problem with your network itself.
John