Hi All , getting the error while completing this module. While my application is running correctly.

Error: Challenge Not yet complete... here's what's wrong: The campingList JavaScript helper isn't saving the new record to the database or adding it to the 'items' value provider.

I am copying code for the finding the bug.

Apex Class:

public class CampingListController {
	@auraenabled
    public static List<Camping_Item__c> getItems (){
        List<Camping_Item__c> CI = [select id, name,price__c,Quantity__c,Packed__c from Camping_Item__c ];
        return CI;
    }
    @auraenabled
    public static Camping_Item__c saveItem (Camping_Item__c CampingItem){
        insert campingItem;
        return campingItem;
    }
}

CampingList.cmp

<aura:component controller="CampingListController">
    <aura:handler name = "init" value="{!this}" action = "{!c.doInit}"/>
	<aura:attribute name="items" type="Camping_Item__c[]"/>
    <aura:attribute name="er" type="boolean" default="false"/>
    <aura:attribute name="newItem" type="Camping_Item__c"    default="{ 'sobjectType': 'Camping_Item__c',
                         'Name': '',
                         'Price__c': 0,
                         'Quantity__c': 0,                         
                         'Packed__c': false
                       }"/>
    <ui:inputText value="{!v.newItem.Name}" aura:id="name" label="name"/>
    <ui:inputCheckbox value="{!v.newItem.Packed__c}" aura:id="Packed" label="Packed"/>
    <ui:inputCurrency value="{!v.newItem.Price__c}"  aura:id="Price" label="Price"/>
    <ui:inputNumber value="{!v.newItem.Quantity__c}" aura:id="Quantity" label="Quantity"/>
    <ui:button label="Create Expense" press="{!c.CreateCamping}" aura:id="button"/>
    <br/>
	<aura:iteration items="{!v.items}" var="PerItem">
        
        <c:campingListItem item="{!PerItem}" />
    </aura:iteration>
</aura:component>

CampingList.js

({
	
    doInit  : function(component, event, helper) {
		var action = component.get("c.getItems");
        action.setCallback(this, function(response){
            var state = response.getState();
           
            if (component.isValid() && state === "SUCCESS") {
           
               
                component.set("v.items", response.getReturnValue());
                 
            }
        });
        
        $A.enqueueAction(action);
	},
    
    CreateCamping : function(component, event, helper){
        
        helper.validateFields (component,component.find("name"));
        helper.validateFields (component,component.find("Price"));
        helper.validateFields (component,component.find("Quantity"));
        if(component.get("v.er") === false)
        {
            var lstItems = component.get("v.items");
            var Item = component.get("v.newItem");
            console.log('Before:'+lstItems);
            lstItems.push(Item);
            helper.CreateCampaign(component,Item);
            component.set("v.items",lstItems);  
             console.log('After:'+lstItems);
            component.set("v.newItem",{ 'sobjectType': 'Camping_Item__c',
                'Name': '',
                'Quantity__c': 0,
                'Price__c': 0,
                'Packed__c': false });
           
        }
	}
    
    
})

CampingListHelper.js

({
	
    validateFields : function (component,field) {
        
        var nameField = field;
        console.log('yes:'+nameField);
        var expname = nameField.get("v.value"); 
        if ($A.util.isEmpty(expname)){
           component.set("v.er",true);
           nameField.set("v.errors", [{message:"this field can't be blank."}]);
        }
        else {
            nameField.set("v.errors", null);
        }
    },
    
    CreateCampaign : function (component,Item){         
        var action = component.get("c.saveItem");
        action.setParams({"CampingItem":Item});
        action.setCallback(this,function(response){
            var state = response.getState();
            if (component.isValid() && state === "SUCCESS") {
                console.log('save');
            }
        });
       $A.enqueueAction(action);        
    }
})

campingListItem.cmp
 

<aura:component >
    
   
    <aura:attribute type="Camping_Item__c" name="item" required="true"/>
    Name:
    <ui:outputText value="{!v.item.Name}" /><br/>
    Packed:
    <ui:outputCheckbox value="{!v.item.Packed__c}" /><br/>
    Price:
    <ui:outputCurrency value="{!v.item.Price__c}" /><br/>
   
    Quantity:
     <ui:outputNumber value="{!v.item.Quantity__c}" /><br/>
    
    <ui:button label="Packed!"  press="{!c.packItem}" aura:id = "Button"/> <br/>
</aura:component>

campingListItem.js

({
	    
    packItem : function(component, event, helper) {
		var pack = component.get("v.item");
        pack.Packed__c = true;
        component.set("v.item",pack);
        var btnClicked = event.getSource();
        btnClicked.set("v.disabled",true);
        
	}
    
    
})

Help me out with it.

Thanks and Regards,
Sai Krishna Tavva.