Tree preservation zone

There is a problem

reference: 1173
name
tree-preservation-order: Oaklawn 151 Coombe Lane West Kingston Upon Thames KT2 7DH
tree-preservation-zone-type: T
geometry: MULTIPOLYGON (((-0.259306 51.416390,-0.259312 51.416341,-0.259268 51.416334,-0.259245 51.416332,-0.259243 51.416348,-0.259202 51.416348,-0.259236 51.416384,-0.259213 51.416392,-0.259169 51.416349,-0.259171 51.416329,-0.258954 51.416326,-0.258641 51.416319,-0.258584 51.416400,-0.258570 51.416404,-0.258502 51.416391,-0.258528 51.416318,-0.258442 51.416318,-0.258453 51.416735,-0.258455 51.416856,-0.258454 51.416861,-0.258435 51.416889,-0.258403 51.416931,-0.258393 51.416948,-0.258362 51.416980,-0.258344 51.416994,-0.258336 51.416999,-0.258306 51.417007,-0.258206 51.417024,-0.258233 51.417110,-0.258213 51.417112,-0.258218 51.417131,-0.258273 51.417125,-0.258271 51.417116,-0.258742 51.417076,-0.258748 51.417071,-0.259232 51.417035,-0.259306 51.416390)))
point: POINT (-0.25883 51.416712)
notes
entry-date: 2018-12-18
start-date: start-date must be a real date
end-date

Your data is missing a start-date.

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