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FreeMarker template error!


Expression tag_list is undefined on line 59, column 16 in movie/movie_list.ftl.
The problematic instruction:
----------
==> if ((tag_list?size)>0) [on line 59, column 9 in movie/movie_list.ftl]
 in user-directive ycs_movie_list [on line 58, column 3 in movie/movie_list.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression tag_list is undefined on line 59, column 16 in movie/movie_list.ftl.
	at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
	at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:134)
	at freemarker.core.BuiltIn$sizeBI._getAsTemplateModel(BuiltIn.java:630)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.ParentheticalExpression._getAsTemplateModel(ParentheticalExpression.java:75)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:111)
	at freemarker.core.ParentheticalExpression.isTrue(ParentheticalExpression.java:66)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.Environment$1.render(Environment.java:233)
	at com.ttyc.admin.Tags.MovieDirective.execute(MovieDirective.java:55)
	at freemarker.core.Environment.visit(Environment.java:261)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:126)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.Environment.process(Environment.java:188)
	at freemarker.template.Template.process(Template.java:237)
	at com.et.mvc.renderer.FreeMarkerViewRenderer.renderView(FreeMarkerViewRenderer.java:131)
	at com.et.mvc.renderer.FreeMarkerViewRenderer.renderView(FreeMarkerViewRenderer.java:1)
	at com.et.mvc.renderer.AbstractViewRenderer.render(AbstractViewRenderer.java:11)
	at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at com.et.mvc.Dispatcher.renderView(Dispatcher.java:186)
	at com.et.mvc.Dispatcher.service(Dispatcher.java:158)
	at com.et.mvc.DispatcherFilter.doFilter(DispatcherFilter.java:251)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
	at org.tuckey.web.filters.urlrewrite.RewrittenUrl.doRewrite(RewrittenUrl.java:176)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:728)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:615)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)
	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1774)
	at java.lang.Thread.run(Thread.java:745)
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