After installing sierra, mac keep asking for password and wont log in

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Warning: unable to access index for repositoryġ: In download.file(url, destfile = f, quiet = TRUE) :

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Warning: failed to download mirrors file (internet routines cannot be loaded) using local file '/anaconda/lib/R/doc/CRAN_mirrors.csv' Please select a CRAN mirror for use in this session. When running R after upgrading my mac to 10.12.6 (Sierra), R can no longer load libraries or access anything on the internet: > install.packages('devtools')

 

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