terraform_init-fail.txt

$ export TF_LOG=TRACE
$ terraform init
2020/01/09 16:26:32 [INFO] Terraform version: 0.12.19
2020/01/09 16:26:32 [INFO] Go runtime version: go1.13.5
2020/01/09 16:26:32 [INFO] CLI args: []string{"/usr/local/bin/terraform", "init"}
2020/01/09 16:26:32 [DEBUG] Attempting to open CLI config file: /Users/local_user/.terraformrc
2020/01/09 16:26:32 [DEBUG] File doesn't exist, but doesn't need to. Ignoring.
2020/01/09 16:26:32 [INFO] CLI command args: []string{"init"}
There are some problems with the configuration, described below.

The Terraform configuration must be valid before initialization so that
Terraform can determine which modules and providers need to be installed.

Error: Variables not allowed

  on providers.tf line 20, in provider "ns1":
  20:     version                = var.ns1_provider.provider_version

Variables may not be used here.