Spring Boot中的JPA存储库“没有类型的合格Bean”

我正在用Spring Boot实现Rest API。由于我的实体类来自另一个包中的一个包，因此我必须使用注释指定它EntityScan。另外，我曾经EnableJpaRepositories指定用于定义JPA存储库的软件包。这是我的项目的样子：

//Application.java

@Configuration
@EnableAutoConfiguration
@ComponentScan
@EntityScan("org.mdacc.rists.cghub.model")
@EnableJpaRepositories("org.mdacc.rists.cghub.ws.repository") 

在我的控制器类中，我自动连接了一个SeqService对象。

//SeqController.java

@Autowired private SeqService seqService;

@RequestMapping(value = "/api/seqs", method = GET, produces = APPLICATION_JSON_VALUE)
public ResponseEntity<List<SeqTb>> getSeqs() {
    List<SeqTb> seqs = seqService.findAll();
    return new ResponseEntity<List<SeqTb>>(seqs, HttpStatus.OK);
}

SeqService是一个接口，我从该接口创建了Bean类SeqServiceBean。在SeqServiceBean我自动接线的JPA存储库中：

// SeqServiceBean.java

@Autowired private SeqRepository seqRepository;

@Override
public List<SeqTb> findAll() {
    List<SeqTb> seqs = seqRepository.findAll();
    return seqs;
}

//SeqRepository.java

@Repository
public interface SeqRepository extends JpaRepository<SeqTb, Integer> {

    @Override
    public List<SeqTb> findAll();

    public SeqTb findByAnalysisId(String analysisId);
}

但是，由于出现以下错误，导致应用程序无法启动：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.mda.rists.cghub.ws.repository.SeqRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.5.RELEASE.jar:4.2.5.RELEASE]

我不明白这个错误。它与合格的bean有什么关系？