org.webmacro.PropertyException$NoSuchMethodWithArgumentsException: No public method concat(org.webmacro.engine.UndefinedMacro) in class java.lang.String at /data/shopserver/resources/v1_whitelabel1_custcategorydetails.wm:25.22
	at org.webmacro.engine.DirectAccessor.get(PropertyOperatorCache.java:1271)
	at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:723)
	at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:826)
	at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:826)
	at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:826)
	at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:826)
	at org.webmacro.engine.PropertyOperatorCache.getProperty(PropertyOperatorCache.java:163)
	at org.webmacro.Context.internalGet(Context.java:383)
	at org.webmacro.Context.getProperty(Context.java:443)
	at org.webmacro.engine.PropertyVariable.getValue(PropertyVariable.java:52)
	at org.webmacro.engine.Variable.evaluate(Variable.java:157)
	at org.webmacro.directive.SetDirective.write(SetDirective.java:91)
	at org.webmacro.engine.Block.write(Block.java:139)
	at org.webmacro.directive.IfDirective.write(IfDirective.java:210)
	at org.webmacro.engine.Block.write(Block.java:194)
	at org.webmacro.engine.WMTemplate.write(WMTemplate.java:324)
	at org.webmacro.engine.WMTemplate.evaluateAsString(WMTemplate.java:253)
	at de.gudberg.finetunes.shopserver.MyAction.makeOutput(MyAction.java:2095)
	at de.gudberg.finetunes.shopserver.CustCatDetailsAction.performAction(CustCatDetailsAction.java:124)
	at de.gudberg.finetunes.shopserver.ActionServlet.doPost(ActionServlet.java:738)
	at de.gudberg.finetunes.shopserver.ActionServlet.doGet(ActionServlet.java:57)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)