에러 발생 질문드려요ㅠㅠ

심각: 클래스 [org.springframework.web.context.ContextLoaderListener]의 애플리케이션 리스너를 설정하는 중 오류 발생

java.lang.NoClassDefFoundError: Lorg/springframework/beans/factory/access/BeanFactoryReference;

at java.lang.Class.getDeclaredFields0(Native Method)

at java.lang.Class.privateGetDeclaredFields(Unknown Source)

at java.lang.Class.getDeclaredFields(Unknown Source)

at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)

at org.apache.catalina.core.DefaultInstanceManager.populateAnnotationsCache(DefaultInstanceManager.java:402)

at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:173)

at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:151)

at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4604)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5143)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)

at java.util.concurrent.FutureTask.run(Unknown Source)

at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)

at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)

at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)

at java.util.concurrent.FutureTask.run(Unknown Source)

at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)

at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)

at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.startup.Catalina.start(Catalina.java:633)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475)

Caused by: java.lang.ClassNotFoundException: org.springframework.beans.factory.access.BeanFactoryReference

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1365)

at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188)

... 37 more

잘 실행되다가 이런 에러에 맞닥뜨리게 되었습니다. 

원인이 무엇일까요...?