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You can check that error by following this Chrome Inspect>>> Network >>> click on redlink >>> now check response You will get actual problem there.
If the problem/error is "Target class controller does not exist" this is the error from laravel as it doesn’t support traditional route declaration anymore so for that You can use:
use App\Http\Controllers\PhonebookController;
Route::get('/users', [PhonebookController::class, 'index']);
// or
Route::get('/users', 'App\Http\Controllers\PhonebookController@index');
Source:stackexchange.com