sentinl: Sentinl Watcher not working.

I am quite new to using Sentinl. Some of the Prerequisites:

Kibana Version: 6.2.2 Elasticsearch Version: 6.2.2 Sentinl Version: 6

As per the sentinl documentation I am currently trying to run the sample example as mentioned here: http://sentinl.readthedocs.io/en/latest/Tutorial/

Getting the following errors while manually trying to run the watcher:

Watchers: fail to get watcher bf098593-8304-4cbc-9ef5-f64001dab5a6

Error: fail to get watcher bf098593-8304-4cbc-9ef5-f64001dab5a6
    at Watcher.<anonymous> (http://some_website/bundles/sentinl.bundle.js?v=16588:1:268707)
    at tryCatch (http://some_website/bundles/vendors.bundle.js?v=16588:63:99706)
    at Generator._invoke (http://some_website/bundles/vendors.bundle.js?v=16588:63:101781)
    at Generator.prototype.(anonymous function) [as throw] (http://some_website/bundles/vendors.bundle.js?v=16588:63:99990)
    at step (http://some_website/bundles/sentinl.bundle.js?v=16588:1:264876)
    at http://some_website/bundles/sentinl.bundle.js?v=16588:1:265037
    at <anonymous>

Not able to understand the issue. Please help me out.