新的Laravel路线不起作用

我有一个问题，laravel中的新路由不起作用，url显示正确的路由但几乎就好像它没有到达我的路由web文件每次只返回 page not found .

我试过：使用 named route ，将函数移动到 different controller ，清除 route cache ，清除 app cache ， dump-auto load ，确保 AllowOverride 设置为 All ，

Web.php：

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});

Auth::routes();

Route::get('/home', 'HomeController@index')->name('home');

/*
|--------------------------------------------------------------------------
| Courses
|--------------------------------------------------------------------------
*/
Route::get('/courses', 'CourseController@index');
Route::get('/courses/create', 'CourseController@create');
Route::get('/courses/{course}', 'CourseController@show');
Route::get('/courses/{course}/edit', 'CourseController@edit');
Route::post('/courses', 'CourseController@store');
Route::patch('/courses/{course}', 'CourseController@update');
Route::delete('/courses/{course}', 'CourseController@destroy')->name('course-delete');

Route::get('/courses/statistics', 'CourseController@statistics');

/*
|--------------------------------------------------------------------------
| First Aid
|--------------------------------------------------------------------------
*/
Route::get('/section/{section}', 'SectionController@show');


/*
|--------------------------------------------------------------------------
| First Aid
|--------------------------------------------------------------------------
*/
Route::get('/progress', 'UserProgressController@index');
Route::get('/progress/create', 'UserProgressController@create');
Route::get('/progress/{section}', 'UserProgressController@show');
Route::get('/progress/formativeresults', 'UserProgressController@formativeresults');
//Route::get('/progress/coursestatistics', 'UserProgressController@coursestatistics');
//Route::get('/progress/{progress}/edit', 'UserProgressController@edit');
Route::post('/progress', 'UserProgressController@store');
//Route::patch('/progress/{progress}', 'UserProgressController@update');
//Route::delete('/progress/{progress}', 'UserProgressController@destroy')->name('progress-delete');

控制器：

public function statistics()
    {
        dd('Test');
       return view('coursestatistics');
    }

查看文件名： coursestatistics.blade.php 文件结构视图/ coursestatistics

链接到页面：

<a class="navbar-brand" href="/courses/statistics">
   {{ __('Statistics') }}
</a>

谁能告诉我可能导致路线不起作用的原因？