Cannot find namespace 'D3'

Hi All,

I am new to the Power BI visuals, and I am trying to build the basic BarChart from the below link.

https://github.com/Microsoft/PowerBI-visuals

Now, the problem is, when I use the command "pbiviz start", I get the below error.

PS C:\Users\<user-name>\barChart> pbiviz start
info Building visual...
error TYPESCRIPT /src/barChart.ts : (27,22) Cannot find namespace 'd3'.
error TYPESCRIPT /src/barChart.ts : (29,36) Cannot find namespace 'd3'.
error TYPESCRIPT /src/barChart.ts : (30,31) Cannot find namespace 'd3'.
error TYPESCRIPT /src/barChart.ts : (31,23) Cannot find namespace 'd3'.
error TYPESCRIPT /src/barChart.ts : (47,34) Cannot find name 'd3'.
error TYPESCRIPT /src/barChart.ts : (88,26) Cannot find name 'd3'.
error TYPESCRIPT /src/barChart.ts : (99,26) Cannot find name 'd3'.
error TYPESCRIPT /src/barChart.ts : (103,26) Cannot find name 'd3'.

Can anyone help me to resolve this issue?

Regards,

Mi2n