Error exception 'Undefined index: request' when invoking to upload image - imgur

Question

I am using the 'j0k3r/php-imgur-api-client' package in my laravel project.
The installation of it seems to be good and lucky.
And I wrote a test seeder script(UnitTestSeeder.php) and a class (ImgurClient.php) as followed：
<?php
use Illuminate\Database\Seeder;
use App\Libs\Service\ImgurClient;
class UnitTestSeeder extends Seeder{
public function run(){
$username = 'your_imgur_username';
$id = 'Iemhfpo';
//$response = $this->galleryFavorites($username);//run ok
//$response = $this->favorites($username);// run ok
//$response = $this->randomGalleryImages();//run ok
//$response = $this->uploadImage();//run error
//$response = $this->createAlbum();//run error
print_r($response);
}
private function uploadImage(){
$client = new ImgurClient();
$fpath = storage_path('app/public/test.jpg');
$imageData = ['image' => $fpath, 'type' => 'file'];
return $client->upload($imageData);
}
private function createAlbum(){
$client = new ImgurClient();
$album_data = [];
$album_data['title'] = 'Bracelet';
$album_data['description'] = 'Beautiful Bracelet';
$album_data['privacy'] = 'public';
$album_data['layout'] = 'grid';
return $client->createAlbum($album_data);
}
private function randomGalleryImages(){
$client = new ImgurClient();
return $client->randomGalleryImages();
}
private function galleryFavorites($username){
$client = new ImgurClient();
return $client->galleryFavorites($username);
}
private function favorites($username){
$client = new ImgurClient();
return $client->favorites($username);
}
But saddly, as the code comments showed above,
Some API calls can't work and some other API calls work well.
The 2 calls(createAlbum and uploadImage) throwed exceptions like this
Please view my screenshot here
Anybody have encountered such errors? Thanks all!