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Action failed: c:campingItemForm$controller$clickCreateItem [Cannot read property 'push' of undefined]
Failing descriptor: {c:campingItemForm$controller$clickCreateItem}

<aura:application extends="force:slds">
    <c:camping />
</aura:application>

<aura:component >
    <aura:attribute name="items" type="Camping_Item__c[]" default="[]"/>
    <aura:attribute name="item" type="Camping_Item__c" default="{
                        'sobjectType': 'Camping_Item__c',
                        'campingItemName': 'campingItemNameDefault',
                        'Price__c': 0,
                        'Quantity__c': '0',
                        'Packed__c': false }"/>
    <c:campingHeader />
    <c:campingItemForm item="{!v.item}" items="{!items}" />
    <c:campingList />
</aura:component>

<aura:component >
    <aura:attribute name="item" type="Camping_Item__c" required="true"/>
    <aura:attribute name="items" type="Camping_Item__c" required="true"/>
    <form class="slds-form--stacked">
            <lightning:input aura:id="campingItemForm" label="Name"
                             name="campingItemName"
                             value="{!v.item.Name}"
                             required="true"/>
            <lightning:input aura:id="campingItemForm" label="Quantity"
                             name="campingItemQuantity"
                             value="{!v.item.Quantity__c}"
                             min="1"
                             placeholder="QQQQQ"/>
            <lightning:input aura:id="campingItemForm" type="number" label="Price"
                             name="campingItemPrice"
                             formatter="currency"
                             step="0.01"
                             value="{!v.item.Price__c}"/>
            <lightning:input aura:id="campingItemForm" type="checkbox" label="Packed"
                             name="cmapingItemIsPacked"
                             checked="{!v.newExpense.Reimbursed__c}"/>
            <lightning:button label="Create Camping Item"
                              class="slds-m-top--medium"
                              variant="brand"
                              onclick="{!c.clickCreateItem}"/>
        </form>
</aura:component>

({
    clickCreateItem : function(component, event, helper) {
        var newItem = component.get("v.item");
        var items = component.get("v.items");
        items.push(newItem);
        newItem = new Camping_Item__c();
        component.set("v.item", item);
        component.set("v.items", items);
    }
})