backports 1.1.1 package fails to install

Question

I am unable to public my R notebook. When I try to publish, I get the following error:

Console~/

Console
R Markdown

    .../R Test 1/Fall Programming with          


        

Answer 1

I solved it reinstalling Rtools (I'm running of Windows).

Answer 2

I'm getting a similar error with the backports R package. It's preventing the devtools package from installing a customised package which I've written.

I fixed it by installing the previous version of backports:

require(devtools)
install_version("backports", version = "1.1.0")