"No qualifying bean of type" for JPA repository in Spring Boot

I am implementing Rest API with Spring Boot. Since my entity classes are from a package from another package, I had to specify that with annotation EntityScan. Also, I used EnableJpaRepositories to specify the package where JPA repository is defined. Here is what my project looks like:

//Application.java

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

In my controller class I had a SeqService object autowired.

//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 is an interface from which I created a Bean class for that SeqServiceBean. In the SeqServiceBean I autowired the JPA repository:

// 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);
}

However the application couldn't start due to the following error:

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]

I don't understand the error. What does it have to do with qualifying bean?