[R] Problems installing devtools from github

[Paul Bernal]

Dear all,

I was using R version 3.3.2 to install devtools and some other packages in
order to create models and generate a web service that can be seen in the
Microsoft Azure Machine Learning Studio environment.

Now, since Azure works with CRAN R version 3.1.0, I decided to download
this R version and retry the following command:

# Install devtools
if(!require("devtools")) install.packages("devtools")
devtools::install_github("RevolutionAnalytics/azureml")

however, I got the following error:

> devtools::install_github("RevolutionAnalytics/azureml")
Downloading GitHub repo RevolutionAnalytics/azureml at master
from URL
https://api.github.com/repos/RevolutionAnalytics/azureml/zipball/master
Installing AzureML
Error in `_digest`(c(list(repos, type), lapply(`_additional`, function(x)
eval(x[[2L]],  :
  object 'digest_impl' not found
>
> devtools::install_github("RevolutionAnalytics/azureml")
Downloading GitHub repo RevolutionAnalytics/azureml at master
from URL
https://api.github.com/repos/RevolutionAnalytics/azureml/zipball/master
Installing AzureML
Error in `_digest`(c(list(repos, type), lapply(`_additional`, function(x)
eval(x[[2L]],  :
  object 'digest_impl' not found

Does anybody know what does this error mean and how to handle it?

Any help will be greatly appreciated,

Best regards,

Paul

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