Call to undefined method GuzzleHttp\Utils::chooseHandler()

[guyzoum77]

Error: Call to undefined method GuzzleHttp\Utils::chooseHandler() in vendor/php-opencloud/openstack/src/Common/Transport/HandlerStack.php:14
Stack trace: ==> vendor/php-opencloud/openstack/src/Common/Service/Builder.php(135): OpenStack\Common\Transport\HandlerStack::create()
==> vendor/php-opencloud/openstack/src/Common/Service/Builder.php(94): OpenStack\Common\Service\Builder->getStack(Object(Closure))
==> vendor/php-opencloud/openstack/src/Common/Service/Builder.php(82): OpenStack\Common\Service\Builder->stockHttpClient(Array, 'Identity\v3')
==> vendor/php-opencloud/openstack/src/OpenStack.php(150): OpenStack\Common\Service\Builder->createService('Identity\v3', Array)
==> OpenStack\OpenStack->identityV3()

[k0ka]

What version of guzzlehttp/guzzle is installed in your project? It must be >7.0 and this method must exist.