I have created a new dedicated server and also b3. Every thing works fine and i can load all maps except highrise and burgertown maps.

whenever i try to run these two maps the server crashes and give me disk read error. Help plz...

A disc read error generally means that your files are corrupt and therefore not readable. Sorry but we can't give you a direct link to the fastfiles. You've to search for them on your own. (invasion.ff, mp_highrise.ff copy them in your zone/english or whatever language you use)