我有一个 Ubuntu 18.04 操作系统，我已经按照此处prometheus的步骤安装了它（我只是更改了链接和版本）。
但是当我尝试使用 启动服务时sudo systemctl start prometheus，出现以下错误/var/log/syslog：
Jan 11 21:46:57 ZiZi prometheus[11585]: level=error ts=2020-01-11T18:16:57.051Z caller=main.go:727 err="error loading config from \"/etc/prometheus/prometheus.yml\": couldn't load configuration (--config.file=\"/etc/prometheus/prometheus.yml\"): parsing YAML file /etc/prometheus/prometheus.yml: yaml: unmarshal errors:\n line 15: field static_configs not found in type config.plain"
这是/etc/prometheus/prometheus.yml（如上述教程中所述）的内容：
global:
scrape_interval: 15s # Set the scrape interval to every 15 seconds.
evaluation_interval: 15s # Evaluate rules every 15 seconds.
scrape_timeout: 15s # scrape_timeout is set to the global default (10s).
# A scrape configuration containing exactly one endpoint to scrape:# Here it's Prometheus itself.
scrape_configs:
# The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
- job_name: 'prometheus'
# metrics_path defaults to '/metrics'
# scheme defaults to 'http'.
static_configs:
- targets: ['localhost:9090']
如何修复错误？