Melati Error Template

org.melati.template.TemplateEngineException: org.melati.template.TemplateEngineException
org.webmacro.PropertyException$NoSuchMethodWithArgumentsException: No public method toWelshHTML(org.webmacro.engine.UndefinedMacro) in class uk.co.gomer.webmacro.GomerTool at /data/melati/httpd/gomer/gomerprod/tomcat/WEB-INF/classes/uk/co/gomer/site/common/header.wm:3.8
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org.webmacro.PropertyException$NoSuchMethodWithArgumentsException: No public method toWelshHTML(org.webmacro.engine.UndefinedMacro) in class uk.co.gomer.webmacro.GomerTool at /data/melati/httpd/gomer/gomerprod/tomcat/WEB-INF/classes/uk/co/gomer/site/common/header.wm:3.8
	at org.webmacro.engine.DirectAccessor.get(PropertyOperatorCache.java:1093)
	at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:631)
	at org.webmacro.engine.PropertyOperatorCache.getProperty(PropertyOperatorCache.java:142)
	at org.webmacro.Context.internalGet(Context.java:387)
	at org.webmacro.Context.getProperty(Context.java:439)
	at org.webmacro.engine.PropertyVariable.getValue(PropertyVariable.java:49)
	at org.webmacro.engine.Variable.write(Variable.java:195)
	at org.webmacro.engine.Block.write(Block.java:93)
	at org.webmacro.engine.WMTemplate.write(WMTemplate.java:262)
	at org.webmacro.directive.IncludeDirective.write(IncludeDirective.java:363)
	at org.webmacro.engine.Block.write(Block.java:159)
	at org.webmacro.engine.WMTemplate.write(WMTemplate.java:262)
	at org.melati.template.webmacro.WebmacroTemplate.write(WebmacroTemplate.java:77)
	at org.melati.template.webmacro.WebmacroTemplateEngine.expandTemplate(WebmacroTemplateEngine.java:182)
	at org.melati.template.webmacro.WebmacroTemplateEngine.expandTemplate(WebmacroTemplateEngine.java:168)
	at org.melati.servlet.TemplateServlet.doPoemRequest(TemplateServlet.java:133)
	at org.melati.servlet.PoemServlet$1.run(PoemServlet.java:261)
	at org.melati.poem.Database$2.run(Database.java:531)
	at org.melati.poem.PoemThread.inSession(PoemThread.java:125)
	at org.melati.poem.Database.perform(Database.java:528)
	at org.melati.poem.Database.inSession(Database.java:598)
	at org.melati.servlet.PoemServlet.doConfiguredRequest(PoemServlet.java:254)
	at org.melati.servlet.ConfigServlet.doGetPostRequest(ConfigServlet.java:167)
	at org.melati.servlet.ConfigServlet.doGet(ConfigServlet.java:143)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:744)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:674)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:866)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:534)