freemarker.core.InvalidReferenceException

[pankaj semwal]

Hi,

     When i checked my log files i got the following exception.



Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression error is undefined on
line 35, column 4 in template/simple/actionerror.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.IteratorBlock$Context.runLoop(IteratorBlock.java:160)
    at freemarker.core.Environment.visit(Environment.java:351)
    at freemarker.core.IteratorBlock.accept(IteratorBlock.java:95)
    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.Environment.process(Environment.java:176)
    at freemarker.template.Template.process(Template.java:232)
    at
org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:168)
    at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:530)
    at org.apache.struts2.components.UIBean.end(UIBean.java:484)
    at
org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:43)
    at
org.apache.jsp.jsp.common.fileupload16_jsp._jspx_meth_s_005factionerror_005f0(fileupload16_jsp.java:126)
    at
org.apache.jsp.jsp.common.fileupload16_jsp._jspService(fileupload16_jsp.java:90)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)


Please tell me how to avoid such exception's.

Thanks