FreeMarker template error!


Expression website_title is undefined on line 67, column 32 in config/variable.inc.html.
The problematic instruction:
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==> assignment: website_title=website_title+"--"+RequestParameters['newsType'] [on line 67, column 9 in config/variable.inc.html]
 in include "variable.inc.html" [on line 2, column 1 in config/config.inc.html]
 in include "/config/config.inc.html" [on line 2, column 1 in cn/load.html]
 in include "load.html" [on line 1, column 1 in cn/news.html]
----------

Java backtrace for programmers:
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freemarker.core.InvalidReferenceException: Expression website_title is undefined on line 67, column 32 in config/variable.inc.html.
	at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
	at freemarker.core.Expression.getStringValue(Expression.java:118)
	at freemarker.core.AddConcatExpression._getAsTemplateModel(AddConcatExpression.java:96)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.AddConcatExpression._getAsTemplateModel(AddConcatExpression.java:77)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.Assignment.accept(Assignment.java:90)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.IfBlock.accept(IfBlock.java:82)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.include(Environment.java:1375)
	at freemarker.core.Include.accept(Include.java:155)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.include(Environment.java:1375)
	at freemarker.core.Include.accept(Include.java:155)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.include(Environment.java:1375)
	at freemarker.core.Include.accept(Include.java:155)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.process(Environment.java:176)
	at freemarker.template.Template.process(Template.java:232)
	at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:427)
	at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:366)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:115)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:106)
	at shield.front.action.filter.NotAllowedToTunFilesFilter.doFilter(NotAllowedToTunFilesFilter.java:156)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at com.kenfor.util.filter.InvalidSQLinjectFilter.doFilter(InvalidSQLinjectFilter.java:58)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at shield.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:39)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at shield.sysadm.website.sitemap.GotoSitemapConfirmfileFilter.doFilter(GotoSitemapConfirmfileFilter.java:74)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:449)
	at java.lang.Thread.run(Thread.java:662)