Sir,

I am experiencing great difficulty with the following Trailhead module:

Lightning Components Basics, Connect to Salesforce with Server-Side Controllers

located at:  https://trailhead.salesforce.com/modules/lex_dev_lc_basics/units/lex_dev_lc_basics_server

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Here is my code:

(campingList.cmp)

<aura:component >
   
 <aura:attribute name="items" type="Camping_Item__c[]"/>
    <aura:attribute name="newItem" type="Camping_Item__c"
                    default="{'sobjectType' : 'Camping_Item__c',
                               'Quantity__c' : 0,
                               'Price__c' : 0}"/>
  <!-- BOXED AREA -->
  <fieldset class="slds-box slds-theme--default slds-container--small">
    <legend id="newCampItemForm" class="slds-text-heading--small
      slds-p-vertical--medium">
      Add Camping Item
    </legend>
    <!-- CREATE NEW CAMPING ITEM FORM -->
    <form class="slds-form--stacked">
      <div class="slds-form-element slds-is-required">
          <div class="slds-form-element__control">
              <ui:inputText aura:id="campItemName" label="Camping Item Name"
                  class="slds-input"
                  labelClass="slds-form-element__label"
                  value="{!v.newItem.Name}"
                  required="true"/>
          </div>
     </div>
     <div class="slds-form-element slds-is-required">
          <div class="slds-form-element__control">
              <ui:inputNumber aura:id="quantity" label="Quantity"
                  class="slds-input"
                  labelClass="slds-form-element__label"
                  value="{!v.newItem.Quantity__c}"
                  required="true"/>
          </div>
      </div>
      <div class="slds-form-element">
          <div class="slds-form-element__control">
              <ui:inputCurrency aura:id="price" label="Price"
                  class="slds-input"
                  labelClass="slds-form-element__label"
                  value="{!v.newItem.Price__c}"/>
          </div>
      </div>
      <div class="slds-form-element">
          <ui:inputCheckbox aura:id="packed" label="Packed?"
              class="slds-checkbox"
              labelClass="slds-form-element__label"
              value="{!v.newItem.Packed__c}"/>
      </div>
      <div class="slds-form-element">
          <ui:button label="Create Camping Item"
              class="slds-button slds-button--brand"
              press="{!c.clickCreateItem}"/>
      </div>
    </form>
    <!-- / CREATE NEW CAMPING ITEM FORM -->
  </fieldset>
        <div class ="slds-card slds-p-top--meduim">
        <header class ="slds-card__header">
            <h3 class = "slds-text-heading--small">Items</h3>
        </header>
        <section class ="slds-card__body">
         <div id="list" class = "row">
             <aura:iteration items="{!v.items}" var="item">
                    <c:campingListItem item="{!item}"/>
                </aura:iteration>
            </div>
        </section>
    </div>
    <!-- i do not think this html is needed any longer
 <ol> 
        <li>Bug Spray</li>
        <li>Bear Repellant</li>
        <li>Goat Food</li>
    </ol>-->
</aura:component>


(campingListController.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)
        {    
&nbsp;           //Here I removed the lines and shifted the code to the helperJs      
            console.log('Before:'+Items);           
            helper.CreateCampaign(component,Item);            
             console.log('After:'+Items);                   
        }
 }   
})


(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); 
//Below lines are shifted from controller Js to helperJs
        var Items = component.get("v.items");
&nbsp;       var Item = component.get("v.newItem");
&nbsp;       Items.push(Item);   
        component.set("v.items",Items);
        component.set("v.newItem",{ 'sobjectType': 'Camping_Item__c',
                'Name': '',
                'Quantity__c': 0,
                'Price__c': 0,
                'Packed__c': false });
    }
})

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When I do the Check Challenge, I receive the following error:

Challenge Not yet complete... here's what's wrong:
The Apex controller 'CampingListController' does not exist.

The only thing that I can find in the Forum help documentation is that my code has a campingListController.js and a campingListHelper.js, others have a .js file named camperList.js

Please advise.

Ryan