Tree preservation zone

There is a problem

reference: TPO 0002 (1972)/A3
name: Bar Hill: Parish
tree-preservation-order: TPO 0002 (1972)
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.018298 52.247856,0.018474 52.247831,0.018796 52.248048,0.018869 52.248184,0.019056 52.248440,0.019216 52.248601,0.019325 52.248743,0.019398 52.248887,0.019573 52.249046,0.019721 52.249155,0.020060 52.249321,0.020179 52.249400,0.019897 52.249458,0.019612 52.249488,0.019440 52.249550,0.019271 52.249628,0.019467 52.250024,0.019569 52.250188,0.019643 52.250350,0.020203 52.251252,0.019950 52.251338,0.019837 52.251164,0.019758 52.251093,0.019333 52.250458,0.019121 52.250097,0.018986 52.249895,0.018964 52.249855,0.018906 52.249693,0.018567 52.248608,0.018470 52.248452,0.018293 52.248138,0.018202 52.248022,0.018102 52.247828,0.017988 52.247510,0.017870 52.247259,0.017851 52.247196,0.017844 52.247123,0.017866 52.246538,0.017913 52.246236,0.017930 52.245986,0.017956 52.245847,0.017954 52.245691,0.017915 52.245558,0.017863 52.245433,0.018069 52.245358,0.018137 52.245621,0.018149 52.245785,0.018022 52.246918,0.017995 52.247000,0.018003 52.247052,0.018161 52.247459,0.018298 52.247856)))
point: POINT (0.018954 52.248822)
notes
entry-date: 2021-08-20
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