MalformedPolicyDocument: Invalid principal in policy: "AWS"

MalformedPolicyDocument: Invalid principal in policy: "AWS"

terraform apply    -var-file=../../aws.tfvars
aws_iam_role.SecurityMonkeyInstanceProfile: Creating...
  arn:                "" => "<computed>"
  assume_role_policy: "" => "{\n      \"Version\": \"2012-10-17\",\n      \"Statement\": [\n        {\n          \"Effect\": \"Allow\",\n          \"Principal\": {\n            \"Service\": \"ec2.amazonaws.com\"\n          },\n          \"Action\": \"sts:AssumeRole\"\n        }\n      ]\n    }"
  name:               "" => "SecurityMonkeyInstanceProfile"
  path:               "" => "/"
  unique_id:          "" => "<computed>"
aws_iam_role.SecurityMonkeyInstanceProfile: Creation complete
aws_iam_role.SecurityMonkey: Creating...
  arn:                "" => "<computed>"
  assume_role_policy: "" => "{\n      \"Version\": \"2008-10-17\",\n      \"Statement\": [\n        {\n          \"Sid\": \"\",\n          \"Effect\": \"Allow\",\n          \"Principal\": {\n            \"AWS\": \"arn:aws:iam::097854366011:role/SecurityMonkeyInstanceProfile\"\n          },\n          \"Action\": \"sts:AssumeRole\"\n        }\n      ]\n    }"
  name:               "" => "SecurityMonkey"
  path:               "" => "/"
  unique_id:          "" => "<computed>"
Error applying plan:

1 error(s) occurred:

* aws_iam_role.SecurityMonkey: Error creating IAM Role SecurityMonkey: MalformedPolicyDocument: Invalid principal in policy: "AWS":"arn:aws:iam::<ACCOUNT_ID:role/SecurityMonkeyInstanceProfile"
	status code: 400, request id: f0b8499b-2d7d-11e6-bd47-f5814282db70

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.