Non-ASCII character in your package

Sometimes it is not possible to use only ASCII character and it prevents to pass the CRAN check.
For example, if you need to use "−"; clearly it will generate an error in the CRAN check.
The solution is to use the chr() and asc() functions of my HelpersMG package available in CRAN:

Do:
> asc("−")
[1] 195 162 203 134 226 128 153

And replace "−" in your code by:
> chr(c(195, 162, 203, 134, 226, 128, 153))
[1] "−"

You will have the magic message:
Status: OK
after your check for CRAN!

https://cran.r-project.org/web/packages/HelpersMG/index.html

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