Expression articlelist.ampage is undefined on line 19, column 22 in articleListBigPic.tpl. The problematic instruction: ---------- ==> if aList?size=1 && articlelist.ampage=="" [on line 19, column 1 in articleListBigPic.tpl] ---------- Java backtrace for programmers: ---------- freemarker.core.InvalidReferenceException: Expression articlelist.ampage is undefined on line 19, column 22 in articleListBigPic.tpl. at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124) at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:121) at freemarker.core.AndExpression.isTrue(AndExpression.java:68) at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.Environment.process(Environment.java:189) at freemarker.template.Template.process(Template.java:237) at com.ectrip.struts2.article.service.HtmlService$HtmlMake.createHtml(HtmlService.java:1904) at com.ectrip.struts2.article.service.HtmlService$HtmlMake.run(HtmlService.java:1858)