I came up with this error recently, each time I clicked on ‘'What’s new’ menu option:
I am describing here what worked for me:
First, double check that OData end-point is working properly from Settings->Developer Resources->Organization Data Service.
If an XML is returned, then.. next step is to double check you have ‘Activity Feeds’ Security Role assigned to you or the user is facing the problem. You can do this by navigating to Settings->Administration->Users->(click on the user)->Roles
After adding this role to the user, feeds under What’s new should be displayed successfully.
Hope it helps,
PP [twitter: @pabloperalta]
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