jsp:getProperty - Name was not previously introduced as per JSP.5.3

I am running in to a problem when trying to set up a bean jsp page. I get the error /WEB-INF/EnterItem.jsp(15,66) jsp:getProperty for bean with name 'itemID'. Name was not previously introduced as per JSP.5.3.

package Catalog;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 *
 */
public class BeanMaker {
    boolean error = false;
    BeanMaker(HttpServletRequest request, String BeanType){
        HttpSession session = request.getSession();
        
        Item itemBean = new Item();
        
        if(BeanType.equals("item"))
        {
            if(Validator.getIntParameter(request.getParameter("itemID"),0)>0){
                itemBean.setItemID(request.getParameter("itemID"));
            }
            else
            {
                error = true;
                itemBean.setItemID("Error with item ID");
            }
                request.setAttribute("item", itemBean);
                
             
            if(Validator.getIntParameter(request.getParameter("itemName"),0)>0){
                itemBean.setItemID(request.getParameter("itemName"));
            }
            else
            {
                error = true;
                itemBean.setItemID("Error with item name");
            }
                request.setAttribute("item", itemBean);
                
            if(Validator.getIntParameter(request.getParameter("itemDescription"),0)>0){
                itemBean.setItemID(request.getParameter("itemDescription"));
            }
            else
            {
                error = true;
                itemBean.setItemID("Error with item description");
            }
                request.setAttribute("item", itemBean);
                
            if(Validator.getIntParameter(request.getParameter("cost"),0)>0){
                itemBean.setItemID(request.getParameter("cost"));
            }
            else
            {
                error = true;
                itemBean.setItemID("Error with cost");
            }
                request.setAttribute("item", itemBean);
        }
    }
}

package Catalog;

/**
 *
 */
public class Item {
    String itemID;
    String itemName;
    String itemDescription;
    String itemCategory;
    String cost;
    int active;
    
    Item(){
        itemID = "";
        itemName = "";
        itemDescription = "";
        itemCategory = "";
        cost = "";
        active = 0;
    }
    
    
    public String getItemID() {
        return itemID;
    }

public void setItemID(String itemID) {
        this.itemID = itemID;
    }

public String getItemName() {
        return itemName;
    }

public void setItemName(String itemName) {
        this.itemName = itemName;
    }

public String getItemDescription() {
        return itemDescription;
    }

public void setItemDescription(String itemDescription) {
        this.itemDescription = itemDescription;
    }

public String getItemCategory() {
        return itemCategory;
    }

public void setItemCategory(String itemCategory) {
        this.itemCategory = itemCategory;
    }

public String getCost() {
        return cost;
    }

public void setCost(String cost) {
        this.cost = cost;
    }

public int getActive() {
        return active;
    }

public void setActive(int active) {
        this.active = active;
    }

}

What could be the cause of this?

"Name was not previously introduced" indicates that you haven't told your JSP about this bean as of yet.

The "name" of the bean used in the jsp:getProperty tag should match the "id" of the bean in the jsp:useBean tag.
i.e.:

Your useBean references an id of "itemBean"
Your getProperty references a name of: "itemID"
Your BeanMaker class stores a request attribute of "item"

These three values should presumably be the same.