Missing NAMESPACE file

library(devtools)
devtools::install_bitbucket("djhshih/argparser")

returns the following error

Downloading bitbucket repo djhshih/argparser@master                                                                                                           
Installing argparser                                                                                                                                          
'/home/ubuntu/miniconda/envs/process-amplicon/lib/R/bin/R' --no-site-file  \                                                                                   
  --no-environ --no-save --no-restore --quiet CMD INSTALL  \                                                                                                   
  '/tmp/RtmpSspyiU/devtools66c04371b36a/djhshih-argparser-a6f58966b0c1'  \                                                                                     
  --library='/home/ubuntu/miniconda/envs/process-amplicon/lib/R/library'  \                                                                                    
  --install-tests                                                                                                                                              

* installing *source* package ‘argparser’ ...                                                                                                                  
ERROR: a 'NAMESPACE' file is required                                                                                                                          
* removing ‘/home/ubuntu/miniconda/envs/process-amplicon/lib/R/library/argparser’                                                                              
Installation failed: Command failed (1)

Valid R packages require a NAMESPACE file. See https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Package-namespaces

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