Unexpected exception while reloading the web-explorer application in Wildfly

12:01:01,999 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-5) JBAS010418: Stopped Driver service with driver-name = modeshape
12:01:02,006 INFO  [javax.enterprise.resource.webservices.jaxws.server.http] (MSC service thread 1-6) WSSERVLET13: JAX-WS context listener destroyed
12:01:02,006 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-8) JBAS010418: Stopped Driver service with driver-name = h2
12:01:02,013 INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-7) JBAS010282: Stopped artifacts/system cache from modeshape container
12:01:02,018 INFO  [org.jboss.as.clustering.infinispan] (MSC service thread 1-7) JBAS010282: Stopped artifacts/default cache from modeshape container
12:01:02,026 WARN  [org.wildfly.extension.undertow] (MSC service thread 1-4) JBAS017537: Failed to persist session attribute connector with value org.modeshape.web.server.impl.ConnectorImpl@4b30efdc for session R-nZpVltBo2E0kvPkCvCxcnR: java.io.NotSerializableException: org.modeshape.web.server.impl.ConnectorImpl
        at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:892) [jboss-marshalling-river-1.4.4.Final.jar:1.4.4.Final]
        at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58) [jboss-marshalling-1.4.4.Final.jar:1.4.4.Final]
        at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111) [jboss-marshalling-1.4.4.Final.jar:1.4.4.Final]
        at org.wildfly.extension.undertow.AbstractPersistentSessionManager.persistSessions(AbstractPersistentSessionManager.java:76)
        at io.undertow.servlet.handlers.SessionRestoringHandler.stop(SessionRestoringHandler.java:90) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
        at io.undertow.servlet.core.DeploymentManagerImpl.stop(DeploymentManagerImpl.java:527) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final]
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.stopContext(UndertowDeploymentService.java:115)
        at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.stop(UndertowDeploymentService.java:101)
        at org.jboss.msc.service.ServiceControllerImpl$StopTask.stopService(ServiceControllerImpl.java:2056)
        at org.jboss.msc.service.ServiceControllerImpl$StopTask.run(ServiceControllerImpl.java:2017)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_40]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_40]
        at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_40]
Caused by: an exception which occurred:
        in object org.modeshape.web.server.impl.ConnectorImpl@4b30efdc