Monitoring jira with Prometheus and Grafana

[Deenesh Sampath]

scrape_configs:
  - job_name: 'Jira app metrics'
    scheme: http
    metrics_path: '/metrics'
    static_configs:
     - targets: ['Jira url']

I have configured the Above configuration in prometheus.yml file and i have enabled the jmx monitoring in my jira Application . Still im getting "Invalid start token error " in prometheus. what is missed ?Could someone help on this