plugin triggers a fatal error

I am having trouble updating this plugin. With the affiliate plugin I had trouble with that so I deleted the one that was up there and then uploaded the new one and that worked fine.
With this plugin it didn't update either so I did the same thing - deleted the folder I had and uploaded the 3.0.5 version but it keeps triggering a fatal error and not working
Please help as now I don't have a domain mapping plugin.

thanks