jsp.error.attribute.null_name

Exception while using struts tag inside JSP.


00000031 ServletWrappe E SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet: /webapp/jsp/Login.jsp. Exception thrown : java.lang.NullPointerException: jsp.error.attribute.null_name


Cause:
I found that in the .jsp, the key value in bean:message is missing double quotes.