Error in Installing Package epiforecast.cpp14funs

Hi, I am trying to install the package `epiforecast.cpp14funs` but could not. Here is the error message:

```r
devtools::install_github("cmu-delphi/epiforecast-R", subdir="epiforecast.cpp14funs")
```

```r
Error: Failed to install 'epiforecast.cpp14funs' from GitHub:
(From warnings)installation of package ‘C:/Users/ADMINI~1/AppData/Local/Temp/RtmpkTWDYh/file378833711d86/epiforecast.cpp14funs_0.0.1.tar.gz’ had non-zero exit status
In addition: Warning message:
In utils::untar(tarfile, ...) :
‘tar.exe -xf "C:\Users\ADMINI~1\AppData\Local\Temp\RtmpkTWDYh\file37887fc1581.tar.gz" -C "C:/Users/ADMINI~1/AppData/Local/Temp/RtmpkTWDYh/remotes37884dc65c0c"’ returned error code 1
```

Could you please help?