接手的公司系统二次开发，新写一个模块，想把NUTZ集成到原有系统中，由于之前系统连接数据库什么的配置都做好了，所以就没写dao.js文件。但是在使用nutz，dao的时候报错,大神帮帮忙，解答一下啊~~~~：

[ERROR][2018-05-29 10:30:38,981][ErrorView.java:48]:[nSuerModule, nSuerDao, dao] # For object [dao] - type:[]
org.nutz.ioc.IocException: [nSuerModule, nSuerDao, dao] # For object [dao] - type:[]
at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:218)
at org.nutz.ioc.val.ReferValue.get(ReferValue.java:24)
at org.nutz.ioc.weaver.FieldInjector.inject(FieldInjector.java:31)
at org.nutz.ioc.weaver.DefaultWeaver.fill(DefaultWeaver.java:56)
at org.nutz.ioc.impl.ObjectMakerImpl.make(ObjectMakerImpl.java:135)
at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:210)
at org.nutz.ioc.val.ReferValue.get(ReferValue.java:24)
at org.nutz.ioc.weaver.FieldInjector.inject(FieldInjector.java:31)
at org.nutz.ioc.weaver.DefaultWeaver.fill(DefaultWeaver.java:56)
at org.nutz.ioc.impl.ObjectMakerImpl.make(ObjectMakerImpl.java:135)
at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:210)
at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:239)
at org.nutz.mvc.impl.processor.ModuleProcessor.process(ModuleProcessor.java:116)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.EncodingProcessor.process(EncodingProcessor.java:27)
at org.nutz.mvc.impl.processor.AbstractProcessor.doNext(AbstractProcessor.java:44)
at org.nutz.mvc.impl.processor.UpdateRequestAttributesProcessor.process(UpdateRequestAttributesProcessor.java:15)
at org.nutz.mvc.impl.NutActionChain.doChain(NutActionChain.java:44)
at org.nutz.mvc.impl.ActionInvoker.invoke(ActionInvoker.java:67)
at org.nutz.mvc.ActionHandler.handle(ActionHandler.java:31)
at org.nutz.mvc.NutFilter.doFilter(NutFilter.java:198)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.gree.scm.web.filter.CrossFilter.doFilter(CrossFilter.java:48)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.jiam.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:32)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.nutz.ioc.ObjectLoadException: Object 'dao' without define!
at org.nutz.ioc.loader.combo.ComboIocLoader.load(ComboIocLoader.java:174)
at org.nutz.ioc.impl.NutIoc.get(NutIoc.java:180)
... 42 more

DAO层代码：

@Inject("dao")
NutDao dao;

public int getNSuer(){
     return dao,count(NSuer.class);
}