timegpt_tbl
# A tibble: 13,032 × 3
   ds                  unique_id     y
   <dttm>              <chr>     <dbl>
 1 2022-04-14 03:00:00 id_333     34.5
 2 2022-04-14 07:00:00 id_333     37  
 3 2022-04-14 11:00:00 id_333     48  
 4 2022-04-14 15:00:00 id_333     41.4
 5 2022-04-14 19:00:00 id_333     40.1
 6 2022-04-14 23:00:00 id_333     28  
 7 2022-04-15 03:00:00 id_333     35.7
 8 2022-04-15 07:00:00 id_333     36  
 9 2022-04-15 11:00:00 id_333     42  
10 2022-04-15 15:00:00 id_333     41.7
# ℹ 13,022 more rows
# ℹ Use `print(n = ...)` to see more rows
> 
> fcst <- nixtla_client_forecast(df = timegpt_tbl, h = 12, id_col = "unique_id", time_col = "ds", target_col = "y")
Frequency chosen: 4h
Error in seq.Date(from = start_date, by = r_freq, length.out = h + 1) : 
  invalid string for 'by'
In addition: Warning message:
All formats failed to parse. No formats found.