2017/08/06 07:59:26 [INFO] Terraform version: 0.10.0  
2017/08/06 07:59:26 [INFO] Go runtime version: go1.8.3
2017/08/06 07:59:26 [INFO] CLI args: []string{"/usr/local/Cellar/terraform/0.10.0/bin/terraform", "plan"}
2017/08/06 07:59:26 [DEBUG] Attempting to open CLI config file: /Users/blalor/.terraformrc
2017/08/06 07:59:26 [DEBUG] File doesn't exist, but doesn't need to. Ignoring.
2017/08/06 07:59:26 [INFO] CLI command args: []string{"plan"}
2017/08/06 07:59:26 [INFO] command: empty terraform config, returning nil
2017/08/06 07:59:26 [DEBUG] command: no data state file found for backend config
2017/08/06 07:59:26 [DEBUG] New state was assigned lineage "7cc953ff-1a26-4aac-99b7-4ff9362a4fea"
2017/08/06 07:59:26 [INFO] command: backend initialized: <nil>
2017/08/06 07:59:26 [DEBUG] checking for provider in "."
2017/08/06 07:59:26 [DEBUG] skipping "provider.tf", not a provider
2017/08/06 07:59:26 [DEBUG] skipping "tf.log", not a provider
2017/08/06 07:59:26 [DEBUG] checking for provider in "/usr/local/Cellar/terraform/0.10.0/bin"
2017/08/06 07:59:26 [DEBUG] skipping "terraform", not a provider
2017/08/06 07:59:26 [DEBUG] checking for provisioner in "."
2017/08/06 07:59:26 [DEBUG] skipping "provider.tf", not a provisioner
2017/08/06 07:59:26 [DEBUG] skipping "tf.log", not a provisioner
2017/08/06 07:59:26 [DEBUG] checking for provisioner in "/usr/local/Cellar/terraform/0.10.0/bin"
2017/08/06 07:59:26 [DEBUG] skipping "terraform", not a provisioner
2017/08/06 07:59:26 [INFO] Failed to read plugin lock file .terraform/plugins/darwin_amd64/lock.json: open .terraform/plugins/darwin_amd64/lock.json: no such file or directory
2017/08/06 07:59:26 [INFO] command: backend <nil> is not enhanced, wrapping in local
2017/08/06 07:59:26 [INFO] backend/local: starting Plan operation
2017/08/06 07:59:26 [DEBUG] New state was assigned lineage "2d3e6389-1be3-4c2f-ad44-18c4aee729b1"
panic: Malformed constraint: ${var.provider_version}

goroutine 19 [running]:
github.com/hashicorp/terraform/plugin/discovery.ConstraintStr.MustParse(0xc4202b6000, 0x17, 0xc42003e9a0, 0x0, 0xc4202b8b40)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/plugin/discovery/version_set.go:28 +0x80
github.com/hashicorp/terraform/terraform.moduleTreeConfigDependencies(0xc4201fd770, 0x0, 0x0)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/terraform/module_dependencies.go:62 +0x8db
github.com/hashicorp/terraform/terraform.ModuleTreeDependencies(0xc4201fd770, 0xc420207680, 0xc4202b8ab0)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/terraform/module_dependencies.go:23 +0x34
github.com/hashicorp/terraform/terraform.NewContext(0xc42026e4d0, 0x0, 0x0, 0x40fe760)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/terraform/context.go:187 +0x1ff
github.com/hashicorp/terraform/backend/local.(*Local).context(0xc42029c320, 0xc420204480, 0x2, 0x2, 0x3, 0xc4202c0380, 0x2)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/backend/local/backend_local.go:63 +0x83e
github.com/hashicorp/terraform/backend/local.(*Local).opPlan(0xc42029c320, 0x40fbea0, 0xc420010490, 0xc420204480, 0xc4202b88d0)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/backend/local/backend_plan.go:57 +0x22f
github.com/hashicorp/terraform/backend/local.(*Local).(github.com/hashicorp/terraform/backend/local.opPlan)-fm(0x40fbea0, 0xc420010490, 0xc420204480, 0xc4202b88d0)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/backend/local/backend.go:243 +0x52
github.com/hashicorp/terraform/backend/local.(*Local).Operation.func1(0xc42029c320, 0xc42027f870, 0xc42027f860, 0x40fbea0, 0xc420010490, 0xc420204480, 0xc4202b88d0)
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/backend/local/backend.go:265 +0x9a
created by github.com/hashicorp/terraform/backend/local.(*Local).Operation
	/private/tmp/terraform-20170802-2619-1pvt5k/terraform-0.10.0/src/github.com/hashicorp/terraform/backend/local/backend.go:266 +0x192