Whenever I try to download Blackberry App World or Facebook to my phone the following page comes up: "The requested item cannot be loaded"

I'm not sure if it is a connection problem, but every other page seems to be okay?
I have all the requirements ie. Version 4.2, but it won't let me download it. This is my 4th Blackberry Curve and the 3rd one with a problem, I'm getting really fed up, please help!?


Thanks.