Free Maker template error in Struts 2

While doing struts 2 project deployments we are facing one major issue related to free marker template.

Quick solution to fix this issue is either upgrade the jar files struts2-core-2.0.6 and xwork-2.0.1 to higher version or else we need to add below mentioned tag in respective jsp page.
add below mentioned tag in header section of that page.

 <sx:head debug="false" parsecontent="true">