olsw

Looks the same to me:

[11-Aug-2021 16:45:39 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function GuzzleHttp\choose_handler() in /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/
src/HandlerStack.php:40
Stack trace:
#0 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/src/Client.php(65): GuzzleHttp\HandlerStack::create()
#1 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/risan/oauth1/src/HttpClient.php(17): GuzzleHttp\Client->__construct()
#2 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/risan/oauth1/src/OAuth1Factory.php(48): Risan\OAuth1\HttpClient->__construct()
#3 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/includes/etsy/class-etsy-syncer.php(51): Risan\OAuth1\OAuth1Factory::create()
#4 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/admin/class-platy-syncer-etsy-admin.php(72): platy\etsy\EtsySyncer->__construct()
#5 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/includes/class-platy-syncer-etsy.php(105): Platy in /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/src/
HandlerStack.php on line 40
[11-Aug-2021 16:45:47 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function GuzzleHttp\choose_handler() in /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/
src/HandlerStack.php:40
Stack trace:
#0 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/src/Client.php(65): GuzzleHttp\HandlerStack::create()
#1 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/risan/oauth1/src/HttpClient.php(17): GuzzleHttp\Client->__construct()
#2 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/risan/oauth1/src/OAuth1Factory.php(48): Risan\OAuth1\HttpClient->__construct()
#3 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/includes/etsy/class-etsy-syncer.php(51): Risan\OAuth1\OAuth1Factory::create()
#4 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/admin/class-platy-syncer-etsy-admin.php(72): platy\etsy\EtsySyncer->__construct()
#5 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/includes/class-platy-syncer-etsy.php(105): Platy in /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/src/
HandlerStack.php on line 40
[11-Aug-2021 16:45:48 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function GuzzleHttp\choose_handler() in /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/
src/HandlerStack.php:40
Stack trace:
#0 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/src/Client.php(65): GuzzleHttp\HandlerStack::create()
#1 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/risan/oauth1/src/HttpClient.php(17): GuzzleHttp\Client->__construct()
#2 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/risan/oauth1/src/OAuth1Factory.php(48): Risan\OAuth1\HttpClient->__construct()
#3 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/includes/etsy/class-etsy-syncer.php(51): Risan\OAuth1\OAuth1Factory::create()
#4 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/admin/class-platy-syncer-etsy-admin.php(72): platy\etsy\EtsySyncer->__construct()
#5 /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/includes/class-platy-syncer-etsy.php(105): Platy in /var/www/wordpress/wp-content/plugins/platycorp-etsy-syncer/vendor/guzzlehttp/guzzle/src/
HandlerStack.php on line 40

I have this same issue and not so keen on going to an earlier version of the other plugin. Can this be looked into or should I look for an alternative plugin?