Error was caused due to a contact field being missing from the consolidated query view used in the export definition.

Go to Marketing and Communications

Click on Segments

Search and select for a 'List' segment not already added to the consolidated list

From the Tasks menu click on ‘Add to consolidated list’

From the Tasks menu click on 'Update consolidated list query view'

From the Tasks menu again click on ‘Remove from consolidated list’ (this step can be missed if you are happy for the segment to be added to the consolidated list)

Following the above steps repopulated the consolidated list query view so that the contact field and resolved the error.