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oracle.xdo.parser.v2.XPathException: Namespace prefix 'ref' used but not declared.	at oracle.xdo.parser.v2.XSLProcessor.reportException(XSLProcessor.java:806)	at oracle.xdo.parser.v2.XSLProcessor.newXSLStylesheet(XSLProcessor.java:614)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at oracle.apps.xdo.common.xml.XSLT10gR1.invokeNewXSLStylesheet(Unknown Source)	at oracle.apps.xdo.common.xml.XSLT10gR1.transform(Unknown Source)	at oracle.apps.xdo.common.xml.XSLT10gR1.transform(Unknown Source)	at oracle.apps.xdo.common.xml.XSLTWrapper.transform(Unknown Source)	at oracle.apps.xdo.template.fo.util.FOUtility.generateFO(Unknown Source)	at oracle.apps.xdo.template.fo.util.FOUtility.generateFO(Unknown Source)	at oracle.apps.xdo.template.FOProcessor.createFO(Unknown Source)	at oracle.apps.xdo.template.FOProcessor.generate(Unknown Source)	at oracle.apps.xdo.servlet.RTFCoreProcessor.transform(RTFCoreProcessor.java:91)	at oracle.apps.xdo.servlet.CoreProcessor.process(CoreProcessor.java:276)	at oracle.apps.xdo.servlet.CoreProcessor.generateDocument(CoreProcessor.java:82)	at oracle.apps.xdo.servlet.ReportImpl.renderBodyHTTP(ReportImpl.java:554)	at oracle.apps.xdo.servlet.ReportImpl.renderReportBodyHTTP(ReportImpl.java:257)	at oracle.apps.xdo.servlet.XDOServlet.writeReport(XDOServlet.java:270)	at oracle.apps.xdo.servlet.XDOServlet.writeReport(XDOServlet.java:250)	at oracle.apps.xdo.servlet.XDOServlet.doGet(XDOServlet.java:178)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.apps.xdo.servlet.security.SecurityFilter.doFilter(SecurityFilter.java:97)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3730)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)