FreeMarker template error!


Expression subBrandId is undefined on line 5, column 29 in WEB-INF/decorators/web/main.ftl.
The problematic instruction:
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==> ${subBrandId} [on line 5, column 27 in WEB-INF/decorators/web/main.ftl]
 in include "global/${subBrandId}/includes.ftl" [on line 5, column 9 in WEB-INF/decorators/web/main.ftl]
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Java backtrace for programmers:
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freemarker.core.InvalidReferenceException: Expression subBrandId is undefined on line 5, column 29 in WEB-INF/decorators/web/main.ftl.
	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:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.renderElementToString(Environment.java:1461)
	at freemarker.core.StringLiteral.getStringValue(StringLiteral.java:95)
	at freemarker.core.Include.accept(Include.java:110)
	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 org.apache.struts2.sitemesh.FreeMarkerPageFilter.applyDecorator(FreeMarkerPageFilter.java:159)
	at org.apache.struts2.sitemesh.TemplatePageFilter.applyDecorator(TemplatePageFilter.java:113)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:59)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
	at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
	at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:164)
	at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
	at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:406)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:270)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:678)
	at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:721)
	at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:643)
	at java.lang.Thread.run(Thread.java:595)