Tree preservation zone

There is a problem

reference: 011/68 A1
name: Tree Preservation Order number TPO 11.68 The Scrapyard, Molesworth
tree-preservation-order: 011/68
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((-0.420188 52.368316,-0.420686 52.368365,-0.421034 52.368345,-0.421290 52.368300,-0.421457 52.368286,-0.422465 52.368236,-0.422613 52.367311,-0.419777 52.367375,-0.419770 52.367619,-0.419777 52.367813,-0.419741 52.368194,-0.419713 52.368329,-0.420188 52.368316),(-0.421278 52.368232,-0.421184 52.368241,-0.421017 52.368291,-0.420699 52.368312,-0.420545 52.368279,-0.420350 52.368263,-0.420175 52.368259,-0.419835 52.368272,-0.419884 52.367972,-0.419902 52.367480,-0.419912 52.367432,-0.422478 52.367368,-0.422366 52.368175,-0.421278 52.368232)))
point: POINT (-0.421136 52.367824)
notes
entry-date: 2007-01-25
start-date: start-date must be a real date
end-date

Your dataset is missing the start-date column.

The Tree preservation zone guidance explains how to fix the issue:

The date that the tree preservation order came into force, written in YYYY-MM-DD format.

Example: 1984-03-28