Can I create timeline chart in Kibana?

Hi @Marco_Liberati,
I have followed you example, from the link Gantt chart on Kibana using version 7.11 - #3 by bab .

I have modified the fields accordingly (see screenshot below):

Unfortunately I get 'Infinite extent for field' error for both StartDate and EndDate.
Do you have any idea why? I am of course looking into debugging this on my own in the meantime.

If successful, I will share the solution.

With regards,
Kamil