How to create a stack bar chart from Azure data explorer plugin

I am trying to create a stack bar cart. My data source is Azure Data explorer.
Below is my query
| summarize source1=sum(Source) by yearvalue=getyear(TimeStamp), Value
| project yearvalue,source1,Value,TimeStamp=now()
X axis: Year

But unable to create. Am i doing anything wrong. Added a screen cast.

sampledata ![Stack|690x388]