Error creating bean with the name 'bookController: Unsatisfied dependency expressed through the field' msBookService '; Nested exception is org. Springframework. Beans. Factory. UnsatisfiedDependencyException: Error creating bean with the name 'msBookService: Unsatisfied dependency expressed through the field' msBookMapper ';

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Children check whether to add the @ MapperScan (basePackages="xx. Mapper") mapper scan configuration