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java.lang.NoSuchMethodError: org.apache.catalina.Container.getLoader()Lorg/apache/catalina/Loader;	at com.orangefunction.tomcat.redissessions.RedisSessionManager.initializeSerializer(RedisSessionManager.java:716)	at com.orangefunction.tomcat.redissessions.RedisSessionManager.startInternal(RedisSessionManager.java:295)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5331)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1092)	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1834)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	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)