How to solve Error in system2(\"cdo\", cmd.args, stdout = TRUE) : '\"cdo\"' not found\n"?

Question

I install climate data operators (CDO) following this link: devtools::install_github("markpayneatwork/ClimateOperators",force = TRUE).

The usage is giving error. For instance , cdo("--version",debug=FALSE) gives the following throwback error:

[1] "Error in system2(\"cdo\", cmd.args, stdout = TRUE) : '\"cdo\"' not found\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in system2("cdo", cmd.args, stdout = TRUE): '"cdo"' not found>
attr(,"cdo.command")
[1] "cdo --version"

Can someone have an idea about how to fix it?

I am trying to process netcdf (climate date witht extension *.nc) file with R using cdo operators.