Fatal error: Uncaught Error: Interface "NCU\Federation\ISignedCloudFederationProvider" not found in /var/www/html/nextcloud/apps/federatedfilesharing/lib/OCM/CloudFederationProviderFiles.php:47 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/federatedfilesharing/lib/OCM/CloudFederationProviderFiles.php on line 47