library(pckg, character.only = T)

[grayskripko]

I'm not sure but when I ran checkpoint::checkpoint() on my linux docker I got a very strange error.

Error : Cannot install packages:
  * cran::pckg: Can't find package called cran::pckg

I couldn't find the exact reason but assume this line in my code library(pckg, character.only = T) could cause the problem. Do your scan functions take into account this special case with character.only? If no I'm sure it should