Guzzle error

Plugin is activated. API keys in place. If we try to add a Zoom meeting we the following error:

2020/05/29 21:35:26 [error] 1034#1034: *447 FastCGI sent in stderr: “PHP message: PHP Fatal error: Uncaught Error: Call to undefined method GuzzleHttp\Client::request() in /sites/testsite.com/files/wp-content/plugins/eroom-zoom-meetings-webinar/zoom-app/Interfaces/Request.php:85

We believe we have Guzzle working on other sites. Not sure what’s going on here.