union in get_initial_queryset in datatable

[Rajshree Some]

list=Model1.objects.filter(
             reservation__in=Model.objects.filter(resource__in=resources).union(
            Model2.objects.filter(
     reservation__in=Model.object.filter(resource__in=resources).defer('col4','col5','col6'), 
             Model3.objects.filter(
                 reservation__in=Model.objects.filter(resource__in=resources),\
            Model4.objects.filter(
                 reservation__in=Model.objects.filter(resource__in=resources).defer('col4')

I am trying to resturn this queryset in get_initial_queryset in datatable.But getting an error 

raise DatabaseError('ORDER BY term does not match any column in the result set.')

[Akinfolarin Stephen]

sorry don't get you can you be more clear with your error

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