Tree preservation zone

There is a problem

reference: 270
name
tree-preservation-order: Former Woodlawn Kingston Vale London SW15
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-0.265031 51.432671,-0.265043 51.432665,-0.264304 51.432330,-0.264145 51.432260,-0.264128 51.432269,-0.264031 51.432337,-0.263914 51.432416,-0.263888 51.432430,-0.263728 51.432533,-0.263703 51.432550,-0.263701 51.432553,-0.263608 51.432609,-0.263619 51.432611,-0.263632 51.432610,-0.263812 51.432496,-0.263866 51.432538,-0.263814 51.432575,-0.263849 51.432625,-0.263829 51.432668,-0.263873 51.432686,-0.263932 51.432691,-0.263938 51.432670,-0.263971 51.432668,-0.263995 51.432664,-0.264014 51.432659,-0.264041 51.432649,-0.264062 51.432638,-0.264134 51.432667,-0.264152 51.432676,-0.264161 51.432674,-0.264171 51.432674,-0.264185 51.432677,-0.264484 51.432811,-0.264533 51.432777,-0.264680 51.432850,-0.264854 51.432766,-0.265031 51.432671)))
point: POINT (-0.264365 51.432571)
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