"Error null"

[gicen]

hola q tal bueno para comentarles tengo este error gracias d antemano


The actual error is:
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at org.aspcfs.modules.troubletickets.actions.
TroubleTickets.executeCommandSearchTickets(Unknown Source)
at sun.reflect.GeneratedMethodAccessor259.invoke(Unkn own Source)
atsun.reflect.DelegatingMethodAccessorImpl.
invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.darkhorseventures.framework.servlets.Controlle rServlet.service(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:803)

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La parte del codigo

public String executeCommandSearchTickets(ActionContext context) {
if (!hasPermission(context, "tickets-tickets-view")) {
return ("PermissionError");
}

System.out.println("executeCommandSearchTickets");
PagedListInfo ticListInfo = this.getPagedListInfo(context, "TicListInfo");

String estado=context.getRequest().getParameter("estado") ;//"estado"
String login =context.getRequest().getParameter("login");
String catCode =context.getRequest().getParameter("catCode");

System.out.println("-->Estado" +estado+ "Login" +login+ "catCode" +catCode);