cannot find target_goups in type config.plain

[amiiy]

Report
What did you do?
I downloaded last version of prometheous from official site and extracted tar -xvzf ~/Downloads/node_exporter-0.11.0.linux-amd64.tar.gz then I run node_exporter in background (not in init) and that running ok on port 9100 as default, but after editing prometheus.yml file and adding below sections:

scrape_configs:
  - job_name: "node"
    scrape_interval: "15s"
    target_groups:
    - targets: ['localhost:9100']

it's throw error and say cannot fine the target_goups in type config.plain.
my machine is arch linux and updated.

What did you expect to see?

What did you see instead? Under which circumstances?

**

• System information:

Linux 4.4.0-141-generic x86_64

• Prometheus version:
  .

prometheus, version 2.6.0 (branch: HEAD, revision: dbd1d58c894775c0788470944b818cc724f550fb)
  build user:       root@bf5760470f13
  build date:       20181217-15:14:46
  go version:       go1.11.3

• Prometheus configuration file:

# my global config
global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets:
      # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  - job_name: "node"
    scrape_interval: "15s"
    target_groups:
    - targets: ['localhost:9100']

tail prometheous.log

level=info ts=2018-12-30T08:52:24.25859707Z caller=main.go:466 msg="Stopping scrape manager..."
level=info ts=2018-12-30T08:52:24.258607975Z caller=main.go:440 msg="Notify discovery manager stopped"
level=info ts=2018-12-30T08:52:24.258626726Z caller=web.go:429 component=web msg="Start listening for connections" address=0.0.0.0:9090
level=info ts=2018-12-30T08:52:24.259101221Z caller=main.go:426 msg="Scrape discovery manager stopped"
level=info ts=2018-12-30T08:52:24.259715512Z caller=manager.go:664 component="rule manager" msg="Stopping rule manager..."
level=info ts=2018-12-30T08:52:24.259734239Z caller=manager.go:670 component="rule manager" msg="Rule manager stopped"
level=info ts=2018-12-30T08:52:24.260075771Z caller=notifier.go:521 component=notifier msg="Stopping notification manager..."
level=info ts=2018-12-30T08:52:24.260098103Z caller=main.go:615 msg="Notifier manager stopped"
level=info ts=2018-12-30T08:52:24.260112794Z caller=main.go:460 msg="Scrape manager stopped"
level=error ts=2018-12-30T08:52:24.260185854Z caller=main.go:624 err="error loading config from \"prometheus.yml\": couldn't load configuration (--config.file=\"prometheus.yml\"): parsing YAML file prometheus.yml: yaml: unmarshal errors:\n  line 24: field target_groups not found in type config.plain"

[codesome]

target_groups -> static_configs.
https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config