With reference to this thread,
I have the same problem, "can't create events list..." in the first footer widget on the site I am working on: http://inhousedev.gsis.edu.hk/revamp/
It seems to be a server issue, as I was initially running it without any problems on another server previously (all the same settings as far as the plug-in and XML feed). Only when I moved the site to our own servers did this become a problem. I'm able to add an RSS widget without a problem at all, so now am not sure what to do...