Error when trying to dispay the web page

java.lang.NullPointerException
     at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:683)
     at javax.faces.webapp.UIComponentTag.encodeBegin(UIComponentTag.java:591)
     at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:478)
any help would be appreciated

Does this error happen for all your web pages or just one web page.
If it just happens with a certain web page, what is different about it?
Is it a page that you created with an earlier version of the IDE?
Sometimes in the stack trace that you cut the error msg from, there will be entries for the web page itself. Did you search through the whole set of stack traces to see if it identified an errant line in the .java file for the web page?
Can you put log("some string") statements in your .java source and view the log to determine when and where the problem is happening?
Have you tried the debugger? See http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/debugging.html

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Error when trying to dispay the web page

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