So the question is, if you are using Tomcat 5, which supports JSP 2.0, how is something trying to reference a JSP 2.1 class which will exist only in Tomcat 6?
i added el-api.jar in lib folder, but now i'm getting this error.
In other words, you have completely screwed up JSP and your Tomcat installation by copying jars that you should not be mucking around with. Remove that jar and start over. All you're doing is making a bigger mess.