While following the trailhead jurney and building an app to track journey, cannot create a chart as the option to "Add Chart" is disabled. How can I enable it?

Hello @Sainath Vaidhyanath, are you sure you have added the requested group ? 

•  In Add column, enter Link and then select Link to add it to the report. Similarly add the Notes column.
• In Add group, enter Type and then select Type to create a grouping.

Eric