Error in .tag_validate(tag, name = "div", class = "form-group shiny-input-container")

[junjunlab]

Hi,thank you for your great package on shiny.But i got errors when i add a help link on a button,this is the error infomation:
Error in .tag_validate(tag, name = "div", class = "form-group shiny-input-container") :
class is: uiform, needs to include: form-groupshiny-input-container,
And this is my code:
selectInput(
inputId = "letter",
label = "Label with popover help",
choices = c("a", "b", "c")
) %>%
shinyInput_label_embed(
shiny_iconlink() %>%
bs_embed_popover(
title = "Letter", content = "Choose a favorite", placement = "left"
)
)

I don't how to solve it,thank you for your help!