dao层bean注入失败

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'app':

Unsatisfied dependency expressed through field 'userDOMapper': No qualifying bean of type [com.cut.dao.UserDOMapper] found for dependency [com.cut.dao.UserDOMapper]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cut.dao.UserDOMapper] found for dependency [com.cut.dao.UserDOMapper]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

求大神解救一下，一直报这个错误，开始我完全照老师的代码，报这个错误，后来我把接口类加上Component注解或者Repository注解反正能换的我都试过了，完全报同样的错误，检查了各个配置的路径也没有错误，代码不报错，编译报错。不知道问题出在哪，怎么解决？？