RSS Feed problem.

have been using an rss feeder (simple rss feeder plugin) for my sites http://www.equinestaff.com.au and equinestaff.co.nz so the jobs can run on the front page- however for some reason my Australian site http://www.equinestaff.com.au is not working suddently so you can view the jobs on the front page under current jobs but its still working for my NZ site http://www.equinestaff.co.nz

Any help as to why its not working would be wonderful.