Getting error for filterStart, Currently using jboss-as-ee-7.2.0.Alpha1-SNAPSHOT.

11:12:54,565 ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-2) Error filterStart

11:12:54,565 ERROR [org.apache.catalina.core.StandardContext] (MSC service thread 1-2) Context [/knowledge] startup failed due to previous errors

11:12:54,597 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC00001: Failed to start service jboss.web.deployment.manage./knowledge: org.jboss.msc.service.StartException in service jboss.web.deployment.manage./knowledge: JBAS018040: Failed to start context

        at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:107)

        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]

        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.2.GA.jar:1.0.2.GA]

        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_10-rc2]

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_10-rc2]

        at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_10-rc2]

Need help