The Target Class Does Not Exist error often occurs when Laravel cannot locate the class being referenced, especially in cases involving dependency injection or service container bindings.

Common Causes:

1. Incorrect namespace in the controller or model file.
2. Service container binding is not properly registered.
3. Autoload cache is outdated.

Step-by-Step Solution:
1.Check the Class Namespace
Ensure the namespace in your file matches the folder structure.

// Example: app/Http/Controllers/UserController.php
namespace App\Http\Controllers;

class UserController {
    // ...
}

2.Update Composer Autoload
Run the following command to refresh the autoload cache:

composer dump-autoload

3.Verify Service Provider Bindings
If using the service container, ensure proper binding in a service provider:

// Example in AppServiceProvider.php
use App\Services\MyService;

public function register()
{
    $this->app->bind('MyService', function () {
        return new MyService();
    });
}

4.Check Dependency Injection Usage
Confirm that the injected class is available and correctly referenced:

// Example in Controller
use App\Services\MyService;

public function __construct(MyService $service)
{
    $this->service = $service;
}