GuzzleHttp library

I get the following error when I use the plugin “WP Offload Media”:
An error of type E_ERROR was caused in line 37 of the file /public/wp-content/plugins/amazon-s3-and-cloudfront-pro/vendor/Gcp/guzzlehttp/guzzle/src/HandlerStack.php. Error message: Uncaught Error: Call to undefined function DeliciousBrains\WP_Offload_Media\Gcp\GuzzleHttp\choose_handler() in /public/wp-content/plugins/amazon-s3-and-cloudfront-pro/vendor/Gcp/guzzlehttp/guzzle/src/HandlerStack.php:37

I get the following back from the developers:
That error suggests that there is another plugin active that also uses the GuzzleHttp library but they have not properly scoped their version so that it does not clash with other plugins. Please can you try deactivating other plugins one by one until you find the culprit and then contact them asking them to scope their libraries like we do?
https://deliciousbrains.com/wp-offload-s3-1-6-released/#how

I disabled the Mollie plugin, and verything works fine.
Can you help me meaning this issue?

Thx!