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I shall assume you are using Php 7.4, as that is the only thing I know to produce that error.

Kiwitrees is not yet compatible with that version of php. There will be an announcement when it is. For now, please change to php 7.3.x.

If not, to fix that error is easy. Edit the file kiwitrees/includes/functions/functions.php at lines 447 and 2470. Replace curly brackets (like { }) with square (like [ ]).
But I cannot guarantee there will not be other issues. Better to change php version.

Nigel
My personal kiwitrees site is www.our-families.info