Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'int HierarchyDefinition.CompareTo(HierarchyDefinition other)' doesn't match implicitly implemented member 'int IComparable<HierarchyDefinition>.CompareTo(HierarchyDefinition? other)' (possibly because of nullability attributes).

Non-nullable property 'Colorize' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'TooltipCreator' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.