Error in re-building vignettes:
  ...
Loading required package: lubridate

Attaching package: 'lubridate'

The following object is masked from 'package:base':

    date

Loading required package: PerformanceAnalytics
Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Registered S3 method overwritten by 'xts':
  method     from
  as.zoo.xts zoo 

Attaching package: 'PerformanceAnalytics'

The following object is masked from 'package:graphics':

    legend

Loading required package: quantmod
Loading required package: TTR
Registered S3 method overwritten by 'quantmod':
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  as.zoo.data.frame zoo 
Version 0.4-0 included new data defaults. See ?getSymbols.
Loading required package: tidyverse
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  as.data.frame.tbl_df tibble
Registered S3 method overwritten by 'rvest':
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  read_xml.response xml2
── Attaching packages ────────────────────────────────── tidyverse 1.2.1 ──
✔ ggplot2 2.2.1     ✔ purrr   0.2.4
✔ tibble  1.4.2     ✔ dplyr   0.7.4
✔ tidyr   0.8.0     ✔ stringr 1.3.1
✔ readr   1.1.1     ✔ forcats 0.3.0
── Conflicts ───────────────────────────────────── tidyverse_conflicts() ──
✖ lubridate::as.difftime() masks base::as.difftime()
✖ lubridate::date()        masks base::date()
✖ dplyr::filter()          masks stats::filter()
✖ dplyr::first()           masks xts::first()
✖ lubridate::intersect()   masks base::intersect()
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Warning in fun_transmute(., OHLC = FALSE, ...) :
  missing values removed from data
Warning: Removed 20 rows containing missing values (geom_path).
Warning: x = 'MA', get = 'stock.prices': Error: MA download failed after two attempts. Error message:
HTTP error 404.
 Removing MA.
Quitting from lines 474-480 (TQ02-quant-integrations-in-tidyquant.Rmd) 
Error: processing vignette ‘TQ02-quant-integrations-in-tidyquant.Rmd’ failed with diagnostics:
object ‘MA’ not found
Execution halted