FreeMarker error when trying to use AJAX Theme

Problem: When giving the <s:head theme="ajax" /> tag in jsp AJAX in struts 2.1.6 or dojo in struts 2.1.6.

FreeMarker template error!



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.

        
 Solution: Replace <s:head theme="ajax">   with <sx:head parseContent="true"/>