Error: Invalid provider local name

╷
│ Error: Invalid provider local name
│
│   on main.tf line 1:
│    1: provider "cyrilgdn/postgresql" {
│
│ cyrilgdn/postgresql is an invalid provider local name: must contain only letters, digits, and dashes, and may not use leading or trailing 
dashes
╵

Terraform PostgreSQL Provider, cyrilgdn