Ошибка - это мягко сказано:
Error:(71, 2) Property must be initialized or be abstract
Error:(71, 10) Property getter or setter expected
Warning:(192, 11) Condition 'var
!= null' is always 'true'
Error:(207, 6) Val cannot be reassigned
Error:(256, 34) Null can not be a value of a non-null type NameTableItem
Error:(260, 2) Property must be initialized or be abstract
Error:(261, 2) Property must be initialized or be abstract
Error:(271, 4) Val cannot be reassigned
Warning:(275, 8) Condition 'top.prev == null' is always 'false'
Error:(277, 6) Val cannot be reassigned
Error:(283, 6) Val cannot be reassigned
Error:(294, 8) Val cannot be reassigned
Error:(301, 6) Val cannot be reassigned
Error:(309, 6) Val cannot be reassigned
Error:(318, 4) Val cannot be reassigned
Error:(326, 15) Null can not be a value of a non-null type Varia