PHP Fatal error: Call to undefined method GuzzleHttp\Promise\Coroutine::of()
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The most recent update just put a stranglehold on my Easy Digital Downloads, throwing the following error whenever someone tries to download a fie:
PHP Fatal error: Uncaught Error: Call to undefined method GuzzleHttp\Promise\Coroutine::of()
Disabling Pixel Caffeine resolves the issue.
Please advise.
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