Forecasting feature

Hi,
I am trying to do a forecast as it is described in this article:
https://powerbi.microsoft.com/en-us/documentation/powerbi-desktop-analytics-pane/
But i cannot see the Forecast group. I see all the other groups like Max line, Min line etc. but not the Forecast group.
Any ideas?

I am using the line chart and a dataset with dates/values.