Area chart does not render, possible due to an issue with vctrs

[avrenli2]

The animated chart does not render properly and it creates the following error messages:

Error occurred in the 1st layer.
Caused by error in unit():
'x' and 'units' must have length > 0
Problem while converting geom to grob.

library(ggplot2)
library(Rcpp)
library(gifski)
library(gganimate)
library(transformr)

library(quantmod)
CHAI <- getSymbols("SBUX" , from="2020-1-1" , to="2021-1-1" , auto.assign=F) 

CATROON <- ggplot(CHAI, aes(y=SBUX.Close,x=index(CHAI)))+
  geom_area(color="pink", size=1.2 , fill="pink" , alpha=0.3)+
  geom_point(color="#8F157E", size=4)+
  labs(x="Time", y="Close Price")+
  theme_bw() + transition_reveal(index(CHAI))  

animate(CARTOON, duration=7 , fps = 30)

[DavisVaughan]

Looks like it works without the geom_area() line but if you uncomment this it fails

library(ggplot2)
library(gganimate)
library(quantmod)

CHAI <- getSymbols("SBUX" , from = "2020-1-1" , to = "2021-1-1" , auto.assign=F) 
CHAI <- as.data.frame(CHAI)
CHAI <- tibble::rownames_to_column(CHAI, "date")
CHAI$date <- as.Date(CHAI$date)

head(CHAI)

CARTOON <- ggplot(CHAI, aes(y = SBUX.Close, x = date)) +
  # geom_area(color="pink", size=1.2 , fill="pink" , alpha=0.3) +
  geom_point(color = "#8F157E", size = 4) +
  labs(x = "Time", y = "Close Price") +
  theme_bw() + 
  transition_reveal(date)  

animate(CARTOON, duration = 7 , fps = 30)

If you uncomment the line above it fails at the animate() step with something like

> animate(CARTOON, duration = 7 , fps = 30)
                                                                                                   
Error in normalizePath(png_files, mustWork = TRUE) : 
  path[4]="/var/folders/41/qx_9ygp112nfysdfgxcssgwc0000gn/T//RtmpvpPgQ3/f246e9ea108/gganim_plot0004.png": No such file or directory
In addition: There were 50 or more warnings (use warnings() to see the first 50)
> warnings()
Warning messages:
1: Problem while converting geom to grob.
ℹ Error occurred in the 1st layer.
Caused by error in `unit()`:
! 'x' and 'units' must have length > 0
2: Problem while converting geom to grob.
ℹ Error occurred in the 1st layer.

@thomasp85 is this a gganimate bug?

[DavisVaughan]

Closing in favor of thomasp85/gganimate#476