Fatal error: Uncaught Error: Interface 'GuzzleHttp\Promise\PromisorInterface' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/files_external_dropbox/vendor/guzzlehttp/promises/src/EachPromise.php:13 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/files_external_dropbox/vendor/guzzlehttp/promises/src/EachPromise.php on line 13