su: ignore --preserve-environment, it's mutually exclusive to --login.
Loading required package: ggplot2
Registered S3 methods overwritten by 'ggplot2':
  method         from 
  [.quosures     rlang
  c.quosures     rlang
  print.quosures rlang

Attaching package: ‘cowplot’

The following object is masked from ‘package:ggplot2’:

    ggsave

Registered S3 method overwritten by 'rvest':
  method            from
  read_xml.response xml2
── Attaching packages ─────────────────────────────────────── tidyverse 1.2.1 ──
✔ tibble  2.0.1       ✔ purrr   0.3.0  
✔ tidyr   0.8.2       ✔ dplyr   0.8.0.1
✔ readr   1.3.1       ✔ stringr 1.3.1  
✔ tibble  2.0.1       ✔ forcats 0.3.0  
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter()   masks stats::filter()
✖ cowplot::ggsave() masks ggplot2::ggsave()
✖ dplyr::lag()      masks stats::lag()

Attaching package: ‘shinydashboard’

The following object is masked from ‘package:graphics’:

    box


Listening on http://127.0.0.1:37728
createTcpServer: address already in use
Error in startServer(host, port, handlerManager$createHttpuvApp()) : 
  Failed to create server
Calls: runApp -> startApp -> startServer
Execution halted