启动tomcat报 Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContex

idea下启动项目，因为我在部署的时候选择了需要应用本地tomcat的配置，也就是

报错信息：

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/BigEduCrm]]
    at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    at java.util.concurrent.FutureTask.get(FutureTask.java:192)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:939)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:872)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/BigEduCrm]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
    ... 6 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot@21ea39d5]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
    at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4860)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4992)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 6 more
Caused by: java.lang.IllegalArgumentException: The main resource set specified [E:\jktd\soft\tomcat\8\apache-tomcat-8.5.20\webapps\BigEduCrm] is not valid
    at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:745)
    at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:703)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 9 more

，因为项目是从eclipse中迁移过来的，eclipse启动项目的时候会在tomcat的conf目录下的server.xml文件添加内容，所以迁移过来的项目启动的时候会起不来，所以我们去掉server.xml下的

<Context docBase="BigEduCrm" path="/.." reloadable="false" source="org.eclipse.jst.j2ee.server:.."/>

重启项目即可。