Php BindingResolutionException和Target不可实例化

错误：

BindingResolutionException in Container.php line 887:
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable.

Route::get('/', 'LoginController@handleProviderCallback');

namespace App\Http\Controllers;

use App\Helpers\Contracts\AccessTokenInterface;

class LoginController extends Controller
{

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance)
    {

        return $accessTokenInstance->getSomething();
    }
}

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Helpers\Contracts\AccessTokenInterface;
use AccessToken;

class TokenServiceProvider extends ServiceProvider
{
    protected $defer = true;

    public function boot()
    {
        //
    }

    public function register()
    {
        $this->app->bind('AccessTokenInterface::class', function(){
            return new AccessToken();
        });
    }
}

namespace App\Helpers;

use App\Helpers\Contracts\AccessTokenInterface;

class AccessToken implements AccessTokenInterface
{
    protected $something;

    public function setSomething()
     {
        $something = 100;
     }

    public function __construct()
    {
        $this->setSomething();
    }

    public function getSomething(){
        return $something;
    }

namespace App\Helpers\Contracts;

Interface AccessTokenInterface
{

    public function getSomething();
    public function setSomething();
}

路线：

BindingResolutionException in Container.php line 887:
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable.

Route::get('/', 'LoginController@handleProviderCallback');

namespace App\Http\Controllers;

use App\Helpers\Contracts\AccessTokenInterface;

class LoginController extends Controller
{

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance)
    {

        return $accessTokenInstance->getSomething();
    }
}

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Helpers\Contracts\AccessTokenInterface;
use AccessToken;

class TokenServiceProvider extends ServiceProvider
{
    protected $defer = true;

    public function boot()
    {
        //
    }

    public function register()
    {
        $this->app->bind('AccessTokenInterface::class', function(){
            return new AccessToken();
        });
    }
}

namespace App\Helpers;

use App\Helpers\Contracts\AccessTokenInterface;

class AccessToken implements AccessTokenInterface
{
    protected $something;

    public function setSomething()
     {
        $something = 100;
     }

    public function __construct()
    {
        $this->setSomething();
    }

    public function getSomething(){
        return $something;
    }

namespace App\Helpers\Contracts;

Interface AccessTokenInterface
{

    public function getSomething();
    public function setSomething();
}

控制器：

BindingResolutionException in Container.php line 887:
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable.

Route::get('/', 'LoginController@handleProviderCallback');

namespace App\Http\Controllers;

use App\Helpers\Contracts\AccessTokenInterface;

class LoginController extends Controller
{

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance)
    {

        return $accessTokenInstance->getSomething();
    }
}

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Helpers\Contracts\AccessTokenInterface;
use AccessToken;

class TokenServiceProvider extends ServiceProvider
{
    protected $defer = true;

    public function boot()
    {
        //
    }

    public function register()
    {
        $this->app->bind('AccessTokenInterface::class', function(){
            return new AccessToken();
        });
    }
}

namespace App\Helpers;

use App\Helpers\Contracts\AccessTokenInterface;

class AccessToken implements AccessTokenInterface
{
    protected $something;

    public function setSomething()
     {
        $something = 100;
     }

    public function __construct()
    {
        $this->setSomething();
    }

    public function getSomething(){
        return $something;
    }

namespace App\Helpers\Contracts;

Interface AccessTokenInterface
{

    public function getSomething();
    public function setSomething();
}

提供商：

BindingResolutionException in Container.php line 887:
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable.

Route::get('/', 'LoginController@handleProviderCallback');

namespace App\Http\Controllers;

use App\Helpers\Contracts\AccessTokenInterface;

class LoginController extends Controller
{

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance)
    {

        return $accessTokenInstance->getSomething();
    }
}

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Helpers\Contracts\AccessTokenInterface;
use AccessToken;

class TokenServiceProvider extends ServiceProvider
{
    protected $defer = true;

    public function boot()
    {
        //
    }

    public function register()
    {
        $this->app->bind('AccessTokenInterface::class', function(){
            return new AccessToken();
        });
    }
}

namespace App\Helpers;

use App\Helpers\Contracts\AccessTokenInterface;

class AccessToken implements AccessTokenInterface
{
    protected $something;

    public function setSomething()
     {
        $something = 100;
     }

    public function __construct()
    {
        $this->setSomething();
    }

    public function getSomething(){
        return $something;
    }

namespace App\Helpers\Contracts;

Interface AccessTokenInterface
{

    public function getSomething();
    public function setSomething();
}

助手：

BindingResolutionException in Container.php line 887:
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable.

Route::get('/', 'LoginController@handleProviderCallback');

namespace App\Http\Controllers;

use App\Helpers\Contracts\AccessTokenInterface;

class LoginController extends Controller
{

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance)
    {

        return $accessTokenInstance->getSomething();
    }
}

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Helpers\Contracts\AccessTokenInterface;
use AccessToken;

class TokenServiceProvider extends ServiceProvider
{
    protected $defer = true;

    public function boot()
    {
        //
    }

    public function register()
    {
        $this->app->bind('AccessTokenInterface::class', function(){
            return new AccessToken();
        });
    }
}

namespace App\Helpers;

use App\Helpers\Contracts\AccessTokenInterface;

class AccessToken implements AccessTokenInterface
{
    protected $something;

    public function setSomething()
     {
        $something = 100;
     }

    public function __construct()
    {
        $this->setSomething();
    }

    public function getSomething(){
        return $something;
    }

namespace App\Helpers\Contracts;

Interface AccessTokenInterface
{

    public function getSomething();
    public function setSomething();
}

界面：

BindingResolutionException in Container.php line 887:
Target [App\Helpers\Contracts\AccessTokenInterface] is not instantiable.

Route::get('/', 'LoginController@handleProviderCallback');

namespace App\Http\Controllers;

use App\Helpers\Contracts\AccessTokenInterface;

class LoginController extends Controller
{

    public function handleProviderCallback(AccessTokenInterface $accessTokenInstance)
    {

        return $accessTokenInstance->getSomething();
    }
}

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Helpers\Contracts\AccessTokenInterface;
use AccessToken;

class TokenServiceProvider extends ServiceProvider
{
    protected $defer = true;

    public function boot()
    {
        //
    }

    public function register()
    {
        $this->app->bind('AccessTokenInterface::class', function(){
            return new AccessToken();
        });
    }
}

namespace App\Helpers;

use App\Helpers\Contracts\AccessTokenInterface;

class AccessToken implements AccessTokenInterface
{
    protected $something;

    public function setSomething()
     {
        $something = 100;
     }

    public function __construct()
    {
        $this->setSomething();
    }

    public function getSomething(){
        return $something;
    }

namespace App\Helpers\Contracts;

Interface AccessTokenInterface
{

    public function getSomething();
    public function setSomething();
}

我已在providers中注册了提供者，并在Helper的别名中注册了AccessToken

我读了一些答案，但找不到解决办法。我是新来的

---

我错在哪里

从提供者的

bind

方法中删除引号：

$this->app->bind(AccessTokenInterface::class, function(){
    return new AccessToken();
});

尝试

$this->app->bind（AccessTokenInterface:：class，AccessToken:：class）不再工作：（我也做了
php-artisan-clear-compiled
和
config:clear
）。