FreeMarker template error!

Expression newsID is undefined on line 28, column 42 in tpl/2015/x/www2.xzbdl.com.cn/displaynews.html.
The problematic instruction:
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==> ${newsID} [on line 28, column 40 in tpl/2015/x/www2.xzbdl.com.cn/displaynews.html]
 in user-directive mytag.ViewNews [on line 28, column 1 in tpl/2015/x/www2.xzbdl.com.cn/displaynews.html]
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Java backtrace for programmers:
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freemarker.core.InvalidReferenceException: Expression newsID is undefined on line 28, column 42 in tpl/2015/x/www2.xzbdl.com.cn/displaynews.html.
        at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
        at freemarker.core.Expression.getStringValue(Expression.java:118)
        at freemarker.core.Expression.getStringValue(Expression.java:93)
        at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
        at freemarker.core.Environment.visit(Environment.java:245)
        at freemarker.core.MixedContent.accept(MixedContent.java:92)
        at freemarker.core.Environment.visit(Environment.java:245)
        at freemarker.core.Environment.renderElementToString(Environment.java:1510)
        at freemarker.core.StringLiteral.getStringValue(StringLiteral.java:95)
        at freemarker.core.StringLiteral._getAsTemplateModel(StringLiteral.java:80)
        at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
        at freemarker.core.UnifiedCall.accept(UnifiedCall.java:110)
        at freemarker.core.Environment.visit(Environment.java:245)
        at freemarker.core.MixedContent.accept(MixedContent.java:92)
        at freemarker.core.Environment.visit(Environment.java:245)
        at freemarker.core.Environment.process(Environment.java:225)
        at freemarker.template.Template.process(Template.java:117)
        at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:310)
        at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:245)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:114)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
        at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
        at shield.front.action.filter.NotAllowedToTunFilesFilter.doFilter(NotAllowedToTunFilesFilter.java:102)
        at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
        at shield.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:67)
        at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
        at shield.front.action.filter.InvalidXSSFilter.doFilter(InvalidXSSFilter.java:58)
        at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
        at com.caucho.filters.GzipFilter.doFilter(GzipFilter.java:169)
        at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
        at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:192)
        at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
        at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265)
        at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:436)
        at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682)
        at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:743)
        at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:662)
        at java.lang.Thread.run(Thread.java:662)