@pradeepsinghsolanki , there is only a slight mistake in the code. You have written the google-chart library as google_chart, that is why the IDE isn’t getting the meaning of all other statements after the setChartLibrary.
You can verify the same through the documentation i.e. https://docs.boltiot.com/docs/gauge
I hope I solved the query 
Do mark my post as the solution so this query can be closed…
1 Like
Thanks 