Error in WHMCS 8.04 na activeren Mollie gateway

[Kyzoe]

Na het installeren van de laatste versie van die module, krijgen we in versie 8.04 de volgende error:

Error: Undefined class constant 'MAJOR_VERSION' in /home/client/domains/client.kyzoe.be/public_html/vendor/guzzlehttp/guzzle/src/Utils.php:121 Stack trace:

0 /home/client/domains/client.kyzoe.be/public_html/vendor/guzzlehttp/guzzle/src/functions.php(61): GuzzleHttp\Utils::defaultUserAgent()

1 /home/client/domains/client.kyzoe.be/public_html/modules/gateways/mollie/vendor/guzzlehttp/guzzle/src/Client.php(194): GuzzleHttp\default_user_agent()

2 /home/client/domains/client.kyzoe.be/public_html/modules/gateways/mollie/vendor/guzzlehttp/guzzle/src/Client.php(75): GuzzleHttp\Client->configureDefaults(Array)

3 /home/client/domains/client.kyzoe.be/public_html/modules/gateways/mollie/vendor/mollie/mollie-api-php/src/MollieApiClient.php(269): GuzzleHttp\Client->__construct(Array)

4 /home/client/domains/client.kyzoe.be/public_html/modules/gateways/mollie/mollie.php(47): Mollie\Api\MollieApiClient->__construct()

5 /home/client/domains/client.kyzoe.be/public_html/modules/gateways/molliebancontact_devapp.php(21): mollie_link(Array, 'bancontact')

6 /home/client/domains/client.kyzoe.be/public_html/vendor/whmcs/whmcs-foundation/lib/Module/AbstractModule.php(0): molliebancontact_devapp_link(Array)

7 /home/client/domains/client.kyzoe.be/public_html/vendor/whmcs/whmcs-foundation/lib/Module/Gateway.php(0): WHMCS\Module\AbstractModule->call('link', Array)

8 /home/client/domains/client.kyzoe.be/public_html/vendor/whmcs/whmcs-foundation/lib/Invoice.php(0): WHMCS\Module\Gateway->call('link', Array)

9 /home/client/domains/client.kyzoe.be/public_html/viewinvoice.php(0): WHMCS\Invoice->getPaymentLink()

10 {main}

De fout treed op wanneer de kalnt een mollie gateway kiest als betaal methode, van ideal, bancontact, of sofort