Error on API Tester

I have a server with Mautic and I want to use the REST API without browser confirmation. So I download the API Tester from https://github.com/mautic/api-library/archive/master.zip to generate an OAuth1a access token that never expires.

When I press the Authorize button the follow error shows up:

Fatal error: Uncaught Error: Class ‘MauticAuthApiAuth’ not found in /home/u210360206/public_html/apitester/index.php:142 Stack trace: #0 {main} thrown in /home/u210360206/public_html/apitester/index.php on line 142



How can I solve this?



Tks

I have a server with Mautic and I want to use the REST API without browser confirmation. So I download the API Tester from https://github.com/mautic/api-library/archive/master.zip to generate an OAuth1a access token that never expires.
When I press the Authorize button the follow error shows up:
Fatal error: Uncaught Error: Class ‘MauticAuthApiAuth’ not found in /home/u210360206/public_html/apitester/index.php:142 Stack trace: #0 {main} thrown in /home/u210360206/public_html/apitester/index.php on line 142

How can I solve this?

Tks