Class Not Found Issue

[dividedbynothing]

Hi ,

I've installed the qr-code-reader to my application via composer (on cake v 3.5.2 and php 7.0.8)

Following the usage instructions, I get the error:
Class 'App\Controller\Libern\QRCodeReader\QRCodeReader' not found

Do I need to add anything thing to my bootstrap to load the plugin? If so, what is the right syntax for that?
And/or do I need to add a use line to my app controller such as:
use Libern\QRCodeReader;
What would be the correct syntax for that if needed?

I've tried different settings with the bootstrap and controller but keep getting the error.

By the way, when I added
Plugin::load('Libern/qr-code-reader');
to my bootstrap, I got an error saying it was not found in the plugins directory (it should be found in vendors).

Thanks in advance for any advice,
D.

[dividedbynothing]

Just to note, I am able to get the khanamiryan plugin to work just by installing into my CakePHP app via composer, then adding
use QrReader;
in my controller, and the using with this:
$qrcode = new QrReader('path/to_image'); $text = $qrcode->text(); //return decoded text from QR Code

So I think the usage instructions here might need a little clarification.
Thanks
D