Subplots using Plotly - Failing to Coerce List to Double

I am trying to create a plot using the subplot function in Plotly. I am following the examples as described here. The code I have written so far:

test_plot <- plot_ly(testData, x = ~timestamp, y = ~reading, 
                     color = ~vessel, colors = "Dark2",
                     yaxis = ~paste0("y", id))
test_plot <- test_plot %>% add_lines()
test_plot <- test_plot %>% subplot(nrows = 6, shareX = TRUE)

But I get the following error:

Error Traceback

Here's the structure of my data:

+---------------------+-----------+---------+-----+
|      timestamp      |  vessel   | reading | id  |
+---------------------+-----------+---------+-----+
| 2019-01-02 09:00:00 | pre_ac_1  | 54      | 5   |
| 2019-01-02 09:00:00 | post_ac_1 | 58      | 3   |
| 2019-01-02 09:00:00 | ac_dif_1  | -4      | 1   |
| 2019-01-02 09:00:00 | pre_ac_2  | 52      | 6   |
| 2019-01-02 09:00:00 | post_ac_2 | 50      | 4   |
| 2019-01-02 09:00:00 | ac_dif_2  | 2       | 2   |
| 2019-01-03 09:00:00 | pre_ac_1  | 56      | 5   |
| 2019-01-03 09:00:00 | post_ac_1 | 60      | 3   |
| ...                 | ...       | ...     | ... |
+---------------------+-----------+---------+-----+

I'm completely lost on why I'm getting this error. I can copy and paste the example from the Plotly website and it works fine, but for some reason when I use my data it fails.

Additionally, I've tried turning the timestamp into a Date class using as.Date() and turning the tibble into a data.frame so it matches what is described in the example but that doesn't seem to be what's causing the issue. Also when I skip the subplot line, it creates a single plot with multiple lines on it.

It would be helpful to have full access to testData, not just a preview of it. Please use something like readr::write_csv() to save a csv file and link to it (or feel free to email it to me)

I sent you an email. I'm hesitant to post that info publicly even though I've scrubbed it of all identifying info.