We got this issue when pulling data from a SharePoint list using REST Web services (used LINQ to SharePoint)
Earlier, the code worked fine and then we added a column in the SharePoint list (Column Name is "Customer"). Then, we started getting this error which contains the column name too. (CustomerId)
So, we updated the service reference (i.e http://sharepointsite/listname/_vti_bin/listdata.svc) and the error vanished.
Hope this helps :)