Laravel Cart and controller - database

Question

I am having issue with the route and controller.
The error code consist of sql column not found which is looking for column id from items table. Which im quite curious due to the differences with my migration.
CartController.php
namespace App\Http\Controllers;
use App\Cart;
use App\CartItem;
use Illuminate\Support\Facades\Auth;
use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
class CartController extends Controller
{
public function __construct()
{
$this->middleware('auth');
}
public function addItem ($itemNo){
$cart = Cart::where('user_id',Auth::user()->id)->first();
if(!$cart){
$cart = new Cart();
$cart->user_id=Auth::user()->id;
$cart->save();
}
$cartItem = new Cartitem();
$cartItem->itemNo=$itemNo;
$cartItem->cart_id= $cart->id;
$cartItem->save();
return redirect('/cart');
}
public function showCart(){
$cart = Cart::where('user_id',Auth::user()->id)->first();
if(!$cart){
$cart = new Cart();
$cart->user_id=Auth::user()->id;
$cart->save();
}
$items = $cart->cartItems;
$total=0;
foreach($items as $item){
$total+=$item->product->price;
}
return view('cart.view',['items'=>$items,'total'=>$total]);
}
public function removeItem($id){
CartItem::destroy($id);
return redirect('/cart');
}
}
ItemController.php
<?php
namespace App\Http\Controllers;
use App\Item;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Facades\File;
class ItemController extends Controller
{
public function index(){
$items = item::all();
return view('admin.items',['items' => $items]);
}
public function destroy($itemNo){
item::destroy($itemNo);
return redirect('/admin/items');
}
public function newItem(){
return view('admin.new');
}
public function add() {
$file = Request::file('file');
$extension = $file->getClientOriginalExtension();
Storage::disk('local')->put($file->getFilename().'.'.$extension, File::get($file));
$entry = new \App\File();
$entry->mime = $file->getClientMimeType();
$entry->original_filename = $file->getClientOriginalName();
$entry->filename = $file->getFilename().'.'.$extension;
$entry->save();
$Item = new Item();
$Item->file_id=$entry->id;
$Item->itemName =Request::input('name');
$Item->itemDescription =Request::input('description');
$Item->price =Request::input('price');
$Item->imageurl =Request::input('imageurl');
$Item->save();
return redirect('admin/items');
}
}