Call to undefined function App\Transaksi()

i have a problem with my coding, i want to count user on my database but it's appear to be like this

Symfony \ Component \ Debug \ Exception \ FatalThrowableError (E_ERROR) Call to undefined function App\Transaksi()

Here's my index.php

 <div class="col-lg-4 col-xs-6">
<!-- small box -->
<div class="small-box bg-aqua">
  <div class="inner">
    <h3></h3>

    <p>Transaksi</p>
  </div>

and my controller.php

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;

class BackController extends Controller
{
public function list()
{

$transaksi = \App\Transaksi::get();
$transaksi = \App\Transaksi('id')->count();

 return view('/admin', compact('list'));
 }

}

and my routes

Route::group(['prefix'=>'user','middleware' => ['auth', 'role:member']], function (){
Route::get('/mybook','FrontController@mybook');

});

Route::group(['prefix'=>'admin','middleware' => ['auth', 'role:admin']], function(){


Route::get('/',function() {
  return view('admin.index');
});
Route::get('/','BackController@list');
Route::get('logout','UserController@logout');

Thanks.

via Chebli Mohamed