14:32:08.965 [localhost-startStop-18] ERROR o.a.g.extension.ExtensionModule - Extension "guacamole-auth-saml-0.9.14.jar" could not be loaded: Authentication provider class not found.
14:32:08.970 [localhost-startStop-18] DEBUG o.a.g.extension.ExtensionModule - Unable to load extension.
org.apache.guacamole.GuacamoleException: Authentication provider class not found.
    at org.apache.guacamole.extension.Extension.getAuthenticationProviderClass(Extension.java:232) ~[classes/:na]
    at org.apache.guacamole.extension.Extension.getAuthenticationProviderClasses(Extension.java:267) ~[classes/:na]
    at org.apache.guacamole.extension.Extension.<init>(Extension.java:444) ~[classes/:na]
    at org.apache.guacamole.extension.ExtensionModule.loadExtensions(ExtensionModule.java:363) [classes/:na]
    at org.apache.guacamole.extension.ExtensionModule.configureServlets(ExtensionModule.java:433) [classes/:na]
    at com.google.inject.servlet.ServletModule.configure(ServletModule.java:53) [guice-servlet-3.0.jar:na]
    at com.google.inject.AbstractModule.configure(AbstractModule.java:59) [guice-3.0.jar:na]
    at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:223) [guice-3.0.jar:na]
    at com.google.inject.spi.Elements.getElements(Elements.java:101) [guice-3.0.jar:na]
    at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:133) [guice-3.0.jar:na]
    at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:103) [guice-3.0.jar:na]
    at com.google.inject.Guice.createInjector(Guice.java:95) [guice-3.0.jar:na]
    at com.google.inject.Guice.createInjector(Guice.java:83) [guice-3.0.jar:na]
    at org.apache.guacamole.GuacamoleServletContextListener.getInjector(GuacamoleServletContextListener.java:89) [classes/:na]
    at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:45) [guice-servlet-3.0.jar:na]
    at org.apache.guacamole.GuacamoleServletContextListener.contextInitialized(GuacamoleServletContextListener.java:81) [classes/:na]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4745) [catalina.jar:8.5.27]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5207) [catalina.jar:8.5.27]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [catalina.jar:8.5.27]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752) [catalina.jar:8.5.27]
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728) [catalina.jar:8.5.27]
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734) [catalina.jar:8.5.27]
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:986) [catalina.jar:8.5.27]
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857) [catalina.jar:8.5.27]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_161]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_161]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]
Caused by: java.lang.ClassNotFoundException: org.apache.guacamole.auth.saml.SAMLAuthenticationProvider
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_161]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_161]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_161]
    at org.apache.guacamole.extension.Extension.getAuthenticationProviderClass(Extension.java:221) ~[classes/:na]
    ... 28 common frames omitted