Fatal errors, documentation poor

  • Typical Amazon cleverness, let down by their inability to communicate. Turning on plugin causes fatal errors, no clue as to how to fix or any documentation on exact php modules or setup required. I tried for a couple of hours and gave up.
    PHP Fatal error: Uncaught Error: Call to undefined method GuzzleHttp\Promise\Coroutine::of() in /var/www/html/wp-content/plugins/amazon-polly/vendor/guzzlehttp/promises/src/functions.php:362

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