单一路线在Laravel 4中给出403 Forbidden错误

我一直在试图找出过去几天发生这种情况的原因并没有成功.我在Laravel中路由时发现了一些其他问题来处理403错误,但没有一个问题涉及单个路由的问题. Laravel和Web开发有点新,所以可能会遗漏一些明显的东西,但是这里有：

所以我的项目中的路由都工作,除了一个,该路由是{mywebsite} / admin,这给了我403错误.当我去{mywebsite} /index.php/admin时,它确实有效.我不明白为什么我的其他路线都没有同样的问题.例如,{mywebsite} / test有效,{mywebsite} / admin / categories有效.这实际上是唯一不起作用的路线.另外值得注意的是,尝试在我的本地服务器和生产服务器(带有Laravel Forge的Digital Ocean)上访问它时会出现同样的问题.

这是我的routes.php文件：

Route::get('/',function()
{
    return View::make('hello'); //works
});

Route::get('/admin',function()
{
    return "admin"; //403 error
});

Route::get('/test',function()
{
    return "test"; //works
});


//these all work
Route::get('/admin/dashboard','TaskCategoriesController@showAdmin');

// all category routes
Route::get('/admin/categories/','TaskCategoriesController@show');
Route::get('/admin/categories/{id}/edit','TaskCategoriesController@edit');
Route::post('/admin/categories/{id}/edit/',array('uses' =>    'TaskCategoriesController@update'));
Route::post('/admin/categories/create/{id}',array('uses' => 'TaskCategoriesController@create'));
Route::get('/admin/categories/delete/{id}',array('uses' => 'TaskCategoriesController@delete'));

Route::get('/admin/categories/create',function()
{
    return View::make('CreateCategory');
});

// all form routes
Route::get('/admin/forms/{id}/edit','TaskFormsController@edit');
Route::post('/admin/forms/{id}','TaskFormsController@create');
Route::post('/admin/forms/{id}/submit','OrdersController@submitOrder');
Route::get('/admin/forms/{id}/add','TaskFormsController@addFormElement');
Route::get('/admin/forms/{id}/edit/{elementId}','TaskFormsController@editFormElement');
Route::get('/admin/forms/{id}/delete/{elementId}','TaskFormsController@deleteFormElement');
Route::post('/admin/forms/{id}/saveUpdates/{tid}','TaskFormsController@updateFormElement');


//time table routes
Route::post('/admin/categories/{id}/timetable/{date}',array('uses' => 'TimeTableController@updateTimetable'));
Route::get('/admin/categories/{id}/timetable',array('uses' => 'TimeTableController@timetable'));
Route::get('/admin/categories/{id}/timetable/{date}',array('uses' => 'TimeTableController@editWeekTable'));

这是我的.htaccess文件：

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews
    </IfModule>

    RewriteEngine On

    # Redirect Trailing Slashes...
    RewriteRule ^(.*)/$/$1 [L,R=301]

    # Handle Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]
</IfModule>

有没有人知道为什么会发生这种情况？

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]