org.hibernate.QueryException: could not resolve property: DownloadFile

帮我找一下原因
public DownloadFile get(String trueUrl, String baseUrl) {
DownloadFile downloadFile = (DownloadFile) sessionFactory
.getCurrentSession()
.createQuery(
"select d from SpiderUrls s inner join fetch s.DownloadFile as d where d.trueUrl =:trueUrl and s.pageUrl =: pageUrl")
.setString("trueUrl", trueUrl).setString("pageUrl", baseUrl).uniqueResult();
return downloadFile;
}
org.hibernate.QueryException: could not resolve property: DownloadFile of: com.spider.service.SpiderUrls [select d from com.spider.service.SpiderUrls s inner join fetch s.DownloadFile as d where d.trueUrl = :trueUrl and s.pageUrl =: pageUrl]
at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:81)
at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:75)
at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1451)
at org.hibernate.hql.ast.tree.FromElementType.getPropertyType(FromElementType.java:312)
at org.hibernate.hql.ast.tree.FromElement.getPropertyType(FromElement.java:487)
at org.hibernate.hql.ast.tree.DotNode.getDataType(DotNode.java:611)
at org.hibernate.hql.ast.tree.DotNode.prepareLhs(DotNode.java:263)
at org.hibernate.hql.ast.tree.DotNode.resolve(DotNode.java:210)
at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:117)
at org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:366)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3583)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3364)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3237)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:724)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:575)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:292)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:235)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:98)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1760)
at com.spider.service.DownloadFileService.get(DownloadFileService.java:33)
at com.spider.service.DownloadFileService$$FastClassByCGLIB$$f3dc331c.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635)
at com.spider.service.DownloadFileService$$EnhancerByCGLIB$$818c190c.get(<generated>)
at com.spider.extractor.ExtractorImage.download(ExtractorImage.java:102)
at com.spider.extractor.ExtractorImage.extract(ExtractorImage.java:73)
at org.archive.crawler.extractor.Extractor.innerProcess(Extractor.java:67)
at org.archive.crawler.framework.Processor.process(Processor.java:109)
at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:306)
at org.archive.crawler.framework.ToeThread.run(ToeThread.java:154)