Missing concrete implementations of 'getter mixin _$Title on Object.content', 'getter mixin _$Title on Object.cover', and 'getter mixin _$Title on Object.title'. Try implementing the missing methods, or make the class abstract - Qiita

Missing concrete implementations of 'getter mixin _$Title on Object.content', 'getter mixin _$Title on Object.cover', and 'getter mixin _$Title on Object.title'. Try implementing the missing methods, or make the class abstractlikers

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