The web Xml contain the following details,

<jsp-config>
<jsp-property-group>
<url-pattern>*.jsff</url-pattern>
<is-xml>true</is-xml>
</jsp-property-group>
<jsp-property-group>
<url-pattern>*.jsp</url-pattern>
<deferred-syntax-allowed-as-literal>true</deferred-syntax-allowed-as-literal>
</jsp-property-group>
<jsp-property-group>
<url-pattern>*.jspx</url-pattern>
<deferred-syntax-allowed-as-literal>true</deferred-syntax-allowed-as-literal>
</jsp-property-group>
</jsp-config>

After deplying the application when tried for the url getting the error:

type Status report

messageOracleJSP error: oracle.jsp.parse.JspParseException: <br>Error: Validator com.sun.faces.taglib.jsf_core.CoreValidator reports:<br>org.xml.sax.SAXParseException: The prefix "c" for element "c:set" is not bound.<br>

descriptionThe server encountered an internal error (OracleJSP error: oracle.jsp.parse.JspParseException: <br>Error: Validator com.sun.faces.taglib.jsf_core.CoreValidator reports:<br>org.xml.sax.SAXParseException: The prefix "c" for element "c:set" is not bound.<br>) that prevented it from fulfilling this request.


Details:

#|2012-11-27T20:07:54.918+0530|INFO|glassfish3.1.2|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=23;_ThreadName=Thread-2;|PWC1412: WebModule[null] ServletContext.log():JspServlet error: Servlet unable to dispatch to the following requested page: The following exception occurred:oracle.jsp.parse.JspParseException:
Error: Validator com.sun.faces.taglib.jsf_core.CoreValidator reports:
org.xml.sax.SAXParseException: The prefix "c" for element "c:set" is not bound.
|#]

[#|2012-11-27T20:07:54.918+0530|INFO|glassfish3.1.2|oracle.j2ee.jsp|_ThreadID=23;_ThreadName=Thread-2;|unable to dispatch JSP page: The following exception occurred:.
oracle.jsp.parse.JspParseException:
Error: Validator com.sun.faces.taglib.jsf_core.CoreValidator reports:
org.xml.sax.SAXParseException: The prefix "c" for element "c:set" is not bound.

     at oracle.jsp.parse.OracleJsp2Java.reportValidationMsgs(OracleJsp2Java.java:777)
     at oracle.jsp.parse.OracleJsp2Java.invokeValidator(OracleJsp2Java.java:755)
     at oracle.jsp.parse.OracleJsp2Java.checkJspTagLibValidator(OracleJsp2Java.java:653)
     at oracle.jsp.parse.OracleJsp2Java.transformImpl(OracleJsp2Java.java:522)
     at oracle.jsp.parse.OracleJsp2Java.transform(OracleJsp2Java.java:593)


Please help me to resolve this..

Regards