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

Nullability of reference types in type of parameter 'other' of 'bool EnumType.Equals(EnumType other)' doesn't match implicitly implemented member 'bool IEquatable<EnumType>.Equals(EnumType? other)' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Non-nullable property 'Id' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'TranslationKey' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Argument of type 'string?[]' cannot be used for parameter 'parameters' of type 'string[]' in 'ValidationMessage.ValidationMessage(SeverityLevel severityLevel, string translationKey, string[] parameters)' due to differences in the nullability of reference types.

Possible null reference argument for parameter 'enumType1' in 'bool EnumType.operator !=(EnumType enumType1, EnumType enumType2)'.

Cannot convert null literal to non-nullable reference type.