【SpringBoot報錯】has an unbound type and no explicit target entity.

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
21-05-18 11:19:39.174 ERROR [main] o.springframework.boot.SpringApplication:837 - Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [com/xxx/config/DatabaseConfig.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Property com.xxx.entity.base.BaseEntity.id has an unbound type and no explicit target entity. Resolve this Generic usage issue or set an explicit target attribute (eg @OneToMany(target=) or use an explicit @Type
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1794)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324)
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226)
  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322)
  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
  at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109)
  at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551)
  at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
  at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
  at com.easylive.mgs.appcore.Application.main(Application.java:12)
Caused by: org.hibernate.AnnotationException: Property com.easylive.mgs.appcore.entity.base.BaseEntity.id has an unbound type and no explicit target entity. Resolve this Generic usage issue or set an explicit target attribute (eg @OneToMany(target=) or use an explicit @Type
  at org.hibernate.cfg.PropertyContainer.assertTypesAreResolvable(PropertyContainer.java:243)
  at org.hibernate.cfg.PropertyContainer.getProperties(PropertyContainer.java:233)
  at org.hibernate.cfg.AnnotationBinder.addElementsOfClass(AnnotationBinder.java:1506)
  at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:222)
  at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:779)
  at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:254)
  at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:230)
  at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:273)
  at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224)
  at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255)
  at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58)
  at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
  at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:391)
  at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:378)
  at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1853)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1790)
  ... 17 common frames omitted

Process finished with exit code 1