strust2 从2.0.11.1升级到2.1.2报的错误

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[ ERROR 2009-11-30 16:21:00 freemarker.runtime - 96 - error ] :
</nobr><br/><br/>Expression parameters.parseContent is undefined on line 45, column 28 in template/ajax/head.ftl.
The problematic instruction:
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==> ${parameters.parseContent?string} [on line 45, column 26 in template/ajax/head.ftl]
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Java backtrace for programmers:
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freemarker.core.InvalidReferenceException: Expression parameters.parseContent is undefined on line 45, column 28 in template/ajax/head.ftl.
        at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
        at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:134)
        at freemarker.core.BuiltIn$stringBI._getAsTemplateModel(BuiltIn.java:358)
        at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
        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.process(Environment.java:176)
        at freemarker.template.Template.process(Template.java:232)
        at org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:182)
        at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:559)
        at org.apache.struts2.components.UIBean.end(UIBean.java:513)
        at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)

工程中加个struts2-dojo-plugin.jar
到页面加上<%@ taglib prefix="sx" uri="/struts-dojo-tags"%>
把<s:head theme="ajax"/>改为<sx:head/>