Unable to restart JBoss after installation of v18.1

I've just installed 18.1 for the first time on my test server. 

When I try to start JBOSS, I'm getting an exception with the following error message :

 

08:40:58,269 WARN [org.jboss.as.ee] (MSC service thread 1-2) JBAS011006: Not installing optional component com.appiancorp.ap2.ListingsServletFilter due to an exception (enable DEBUG log level to see the cause)
08:40:58,503 WARN [org.jboss.as.ee] (MSC service thread 1-2) JBAS011006: Not installing optional component com.appiancorp.common.BootstrapSpringContextLoaderListener due to an exception (enable DEBUG log level to see the cause)
08:40:58,597 INFO [org.jboss.as.connector.deployers.RADeployer] (MSC service thread 1-1) IJ020002: Deployed: file:/d:/appian/ear/suite.ear/unattended-request-poller.rar/
08:40:58,597 INFO [org.jboss.as.connector.deployers.RADeployer] (MSC service thread 1-3) IJ020002: Deployed: file:/d:/appian/ear/suite.ear/email-poller.rar/
08:40:58,894 INFO [org.jboss.web] (ServerService Thread Pool -- 209) JBAS018210: Register web context: /suite
08:40:59,003 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/suite]] (ServerService Thread Pool -- 209) JBWEB000285: Error configuring application listener of class com.appiancorp.common.BootstrapSpringContextLoaderListener: java.lang.ClassNotFoundException: com.appiancorp.common.BootstrapSpringContextLoaderListener from [Module "deployment.suite.ear.web.war:main" from Service Module Loader]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:213) [jboss-modules.jar:1.3.6.Final-redhat-1]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459) [jboss-modules.jar:1.3.6.Final-redhat-1]
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408) [jboss-modules.jar:1.3.6.Final-redhat-1]
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389) [jboss-modules.jar:1.3.6.Final-redhat-1]
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134) [jboss-modules.jar:1.3.6.Final-redhat-1]
at org.jboss.as.web.deployment.WebInjectionContainer.newInstance(WebInjectionContainer.java:78) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3294) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3780) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.jboss.as.web.deployment.WebDeploymentService.doStart(WebDeploymentService.java:163) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
at org.jboss.as.web.deployment.WebDeploymentService.access$000(WebDeploymentService.java:61) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
at org.jboss.as.web.deployment.WebDeploymentService$1.run(WebDeploymentService.java:96) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_121]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_121]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_121]
at org.jboss.threads.JBossThread.run(JBossThread.java:122)

 

I have increased logging to DEBUG in logging.properties, but no further details are output.

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