Can't provision the contabo vps using official contabo provider on terraform

[haseeb-aziz]

Provider verison = "0.1.26"

contabo_instance.mail_server: Creating...
╷
│ Error: API error, status code: 500
│
│ with contabo_instance.mail_server,
│ on main.tf line 1, in resource "contabo_instance" "mail_server":
│ 1: resource "contabo_instance" "mail_server" {
│
│ API error, status code: 500, details: Internal Server Error, retry or contact support