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I am working on setting up a Cloud9 environment using Terraform, I ran into an issue when it comes to my Terraform apply and specifically:

Error: Error applying plan: 1 error(s) occurred: * aws_instance.cloud9Test: 1 error(s) occurred: * aws_instance.cloud9Test: Error launching instance, possible mismatch of Security Group IDs and Names. See AWS Instance docs here: https://terraform.io/docs/providers/aws/r/instance.html. AWS Error: Value () for parameter groupId is invalid. The value cannot be empty

Here is my Terraform code that seems to be related and causing the issue. 

resource "aws_vpc" "cloud9Test" { cidr_block = "10.0.0.0/16" instance_tenancy = "dedicated" tags = { Name = "cloud9Test" } } resource "aws_security_group" "cloud9Test" { name = "cloud9Test-sg" description = "Cloud9 Group" vpc_id = "${aws_vpc.cloud9Test.id}" }

When I comment out the vpc_id in the security group I don't have the issue anymore but I do want the security group inside my VPC.

How do I fix this?

Note I do not have anything that should overlap causing an issue, this is a fairly new account with only 3 ec2 instances and 1 cloud9 instance all created manually

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I'll go out on a limb here and assume that the issue is actually in your "aws_instance" block and is likely the result of how you are assigning the security groups in the "aws_instance".

Copied from the first linked article, in the resolution: 

change security_groups = ["cloud9Test"] to vpc_security_group_ids = ["${aws_security_group.cloud9Test.id}"]

Two related articles:

https://github.com/KainosSoftwareLtd/aws-api-gateway-demo/issues/3

https://stackoverflow.com/questions/31569910/terraform-throws-groupname-cannot-be-used-with-the-parameter-subnet-or-vpc-se/34586893#34586893

If this is not on track, please post the "aws_instance" declaration.

For your own sanity I'd also recommend giving the resources names that are more specific to their role, and not identical, for example "cloud9Test_vpc".

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