aws configuration: Mismatch of Security group IDs and names

I have the following configuration:

resource "aws_security_group""allow_ssh" {
  name = "allow_ssh"
  vpc_id = "${aws_default_vpc.default.id}"
  description = "Allow ssh connections on port 22"
  ingress {
      from_port = 22
      to_port = 22
      protocol = "tcp"
      cidr_blocks = ["0.0.0.0/0"]
  }
}

resource "aws_instance""your-app" {
  ami           = "ami-2757f631"
  instance_type = "t2.micro"
  security_groups = ["${aws_security_group.allow_ssh.id}"]
  key_name = "${aws_key_pair.twilio_key.key_name}"
}

When I do terraform apply, I get this error:

* aws_instance.your-app: 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

What should I do to solve the above error ?