Tree preservation zone

There is a problem

reference: TPO 0014 (1967)/A1
name: LOLWORTH The Grange
tree-preservation-order: TPO 0014 (1967)
tree-preservation-zone-type: area
geometry: MULTIPOLYGON (((0.006644 52.260803,0.006362 52.260567,0.005944 52.257298,0.006941 52.256919,0.008239 52.256372,0.009286 52.257151,0.009397 52.257264,0.009672 52.257450,0.009725 52.257531,0.010133 52.257702,0.010282 52.257771,0.010458 52.257867,0.010729 52.257831,0.010894 52.257929,0.011042 52.257870,0.011114 52.257866,0.011193 52.257873,0.011228 52.257900,0.011266 52.257991,0.011257 52.258111,0.011236 52.258180,0.011175 52.258199,0.011139 52.258187,0.010978 52.258178,0.010396 52.258480,0.009894 52.258674,0.009500 52.258479,0.009293 52.258453,0.009179 52.258540,0.009068 52.258467,0.008757 52.258338,0.008201 52.258547,0.008163 52.258576,0.008020 52.258647,0.007824 52.258785,0.007800 52.258810,0.007780 52.258857,0.007726 52.258902,0.007697 52.259101,0.007704 52.259178,0.007741 52.259346,0.007873 52.259638,0.007924 52.259708,0.008049 52.259851,0.008339 52.260133,0.008380 52.260133,0.008369 52.260147,0.008647 52.260363,0.007006 52.261022,0.006756 52.261112,0.006034 52.261412,0.005942 52.261288,0.005872 52.261226,0.006056 52.261167,0.006555 52.260934,0.006633 52.260855,0.006644 52.260803)))
point: POINT (0.007781 52.258505)
notes
entry-date: 2021-08-20
start-date: start-date must be a real date
1968-01-03
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