In seq(from=created, by = "month", length.out = 12) from- error

Hi dear community.
I’m trying to analyse our MRR from Srtipe following thisamazing article.

Now trying to convert year in month, the mutate() step returns ‘8. Custom R Command’ step has an error. Error : Problem with mutate() column recurring_month. :information_source: recurring_month = list(seq(from = created, by = "month", length.out = 12)). :heavy_multiplication_x: ‘from’ must be of length 1 :information_source: The error occurred in group 1: customer_id = “cus_FOlMdeHUzEUL3b”.

Does anyone have similar issues?
Looking very much to your replies. Thank you beforehand <3