Running a RMarkdown file, i get these errors

#library(shiny)
library(rmarkdown)
library(knitr)
library(ggplot2)
library(data.table)
library(knitr)
library(readxl)
library(stringr)
library(maps)
library(scales)
library(stringr)
#library(devtools)

opts_chunk$set(echo = FALSE, warning = FALSE, error = FALSE, message = FALSE)

these are the errors i am receiving:

Error in download.file(url = vurl, destfile = vfile, quiet = quiet) : 
  cannot open URL 'https://go.microsoft.com/fwlink/?linkid=827098&clcid=0x409'
In addition: Warning message:
In download.file(url = vurl, destfile = vfile, quiet = quiet) :
  cannot open URL 'https://go.microsoft.com/fwlink/?linkid=827098&clcid=0x409': HTTP status was '400 Bad Request'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib:
  cannot open URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/src/contrib/PACKAGES'
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