NamingException: このクラスローダーにバインドされているネーミング・コンテキストがありません。

at org.apache.naming.ContextBindings.getClassLoader(ContextBindings.java:350)
at org.apache.catalina.deploy.NamingResources.cleanUp(NamingResources.java:985)
at org.apache.catalina.deploy.NamingResources.stopInternal(NamingResources.java:968)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5743)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:272)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:1040)
at org.apache.catalina.core.ContainerBase.destroyInternal(ContainerBase.java:1233)
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:1040)
at org.apache.catalina.core.ContainerBase.destroyInternal(ContainerBase.java:1233)
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305)
at org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:593)


Solution.
Right-click the project -->Build Path -->Configure Build Path... -->Check Libraries




As shown in the image above, tomcatv6 and tomcatv7 appear. Delete one. Restart tomcat.
If you still get this error, remove tomcat from the above image and
Add Library... -->Server Runtime-->Next-->Check the installed tomcat-->Finish