R Error : (converted from warning) unable to re-encode 'BetaDiv.R' lines 120, 170, 201

[wolvesled]

> install_local("C://tempscp//amplicon-master.zip")
Installing package into ‘C:/Users/Wolvesled/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)
* installing *source* package 'amplicon' ...
** using staged installation
** R
Error : (converted from warning) unable to re-encode 'BetaDiv.R' lines 120, 170, 201
ERROR: unable to collate and parse R files for package 'amplicon'
* removing 'C:/Users/Wolvesled/Documents/R/win-library/4.0/amplicon'
Error: Failed to install 'amplicon-master.zip' from local:
  (converted from warning) installation of package ‘C:/Users/******/amplicon-master’ had non-zero exit status

seems encoding error at 'BetaDiv.R' lines 120, 170, 201