Chart Generator Action not working?

Hi, pickaxe said it has completed generating the chart from the data but there isn’t any chart displayed. I attach a screenshot here to show what I mean.

I was on Gold but I thought this was only available on Pro, now that I upgraded on Pro, it still doesn’t work (no chart generated). Appreciate your help.

FYI, I did not modify the chart action, it is still the ‘default’ prompt. Pls advise what things I missed. TQ