PHP Fatal error: Class 'Curl\Curl' not found

[thebringerofdeath789]

Im getting this error:
PHP Fatal error: Class 'Curl\Curl' not found in /redacted/proxmox/vendor/saleh7/proxmox-ve_php_api/src/Request.php on line 46

This is on a debian 9 server running php 5.6, with a fresh composer install from the getcomposer site.
php-curl is installed on the system.

[thebringerofdeath789]

eventually i tried ' composer require curl/curl' and it resolved the above error but it just gives me quite a few more different errors before failing to get a ticket / etc.

PHP Notice: Undefined property: Curl\Curl::$data in /proxmox/vendor/saleh7/proxmox-ve_php_api/src/Request.php on line 59
PHP Notice: Trying to get property of non-object in /proxmox/vendor/saleh7/proxmox-ve_php_api/src/Request.php on line 59
PHP Notice: Undefined property: Curl\Curl::$data in /proxmox/vendor/saleh7/proxmox-ve_php_api/src/Request.php on line 61
PHP Notice: Trying to get property of non-object in /proxmox/vendor/saleh7/proxmox-ve_php_api/src/Request.php on line 61

[ferdl9999]

Exactly the same problem here. php7.3 installed on debian 9 with a fresh install of composer.

php-curl or php7.3-curl is also installed on the system. I also tried the command composer require curl/curl but then there are just other errors.

[emresaracoglu]

composer require php-curl-class/php-curl-class