[R] R2wd

[rookie r user]

Hi all, 

I'm currently trying to get accustomed to R and some of its packages, thus
need some help for a package called R2wd. As I am trying to use the wdGET()
function I'm getting the following message:

Error in if (!(tmp[["ActiveDocument"]][["Name"]] == filename))
tmp$Open(paste("path",  : 
  argument is of length zero

Does anybody know what that means?

Best,
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