org.apache.xml.dtm.ref.DTMManagerDefault cannot be cast to org.apache.xml.dtm.DTMManager

[saurabh agr]

hi,
i am trying to deploy an application on jboss7 server but got this error :

11:46:47,532 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[virtualservername].[/]] (MSC service thread 1-2) action: null: java.lang.ClassCastException: org.apache.xml.dtm.ref.DTMManagerDefault cannot be cast to org.apache.xml.dtm.DTMManager
at org.apache.xml.dtm.DTMManager.newInstance(DTMManager.java:137) [elibA.jar:]
at org.apache.xpath.XPathContext.<init>(XPathContext.java:102) [elibA.jar:]
at org.apache.xpath.jaxp.XPathImpl.eval(XPathImpl.java:207)
at org.apache.xpath.jaxp.XPathImpl.evaluate(XPathImpl.java:476)
at sg.gov.dsta.gebiz.afw.webutil.validator.GebizValidatorPlugin$ValidationsLoader.loadValidationData(GebizValidatorPlugin.java:72) [classes:]
at sg.gov.dsta.gebiz.afw.webutil.validator.GebizValidatorPlugin$ValidationsLoader.access$0(GebizValidatorPlugin.java:69) [classes:]
at sg.gov.dsta.gebiz.afw.webutil.validator.GebizValidatorPlugin.init(GebizValidatorPlugin.java:52) [classes:]
at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:869) [struts.jar:]
at org.apache.struts.action.ActionServlet.init(ActionServlet.java:336) [struts.jar:]
at javax.servlet.GenericServlet.init(GenericServlet.java:242) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1102) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3631) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3844) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_30]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_30]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_30]

please inform where i am wrong.

thanks