Error in loading 'rvest' package

Question

Hi Team,

I am trying to load rvest package into Azure ML. Initially I bundled and uploaded xml2 and rvest packages as per the following code.

install.packages("src/xml2_0.1.2.zip", lib = ".", repos = NULL, verbose = TRUE)
install.packages("src/rvest_0.3.1.zip", lib = ".", repos = NULL, verbose = TRUE)
library(xml2, lib.loc=".", verbose=TRUE)
library(rvest, lib.loc=".", verbose=TRUE)

Both the packages got installed successfully. xml2 was attached successfully, but rvest failed.

Then, as suggested in the forum here https://social.msdn.microsoft.com/Forums/azure/en-US/706c610f-dfd2-4e02-9978-b74f5345713e/issue-deploying-curl-into-azure-ml?forum=MachineLearning, I included selectr package also as per the following code.

install.packages("src/selectr_0.2-3.zip", lib = ".", repos = NULL, verbose = TRUE)
install.packages("src/xml2_0.1.2.zip", lib = ".", repos = NULL, verbose = TRUE)
install.packages("src/rvest_0.3.1.zip", lib = ".", repos = NULL, verbose = TRUE)
library(selectr, lib.loc=".", verbose=TRUE)
library(xml2, lib.loc=".", verbose=TRUE)
library(rvest, lib.loc=".", verbose=TRUE)

Even now also I having issue in attaching rvest package. I am getting following error.

Error 0063: The following error occurred during evaluation of R script:
---------- Start of error message from R ----------
package or namespace load failed for 'rvest'

package or namespace load failed for 'rvest'
----------- End of error message from R -----------
Start time: UTC 05/11/2016 13:36:36
End time: UTC 05/11/2016 13:36:48

Please help in resolving this.

Thanks.

with regards,

Parthiban

Answer 1

Hi Parthiban!

The rvest package depends on a newer version of httr than what's pre-installed with Execute R module. Try adding httr_1.1.0.zip to your package, and install as follows:

install.packages("src/selectr_0.2-3.zip", lib = ".", repos = NULL, verbose = TRUE)
install.packages("src/xml2_0.1.2.zip", lib = ".", repos = NULL, verbose = TRUE)
install.packages("src/httr_1.1.0.zip", lib = ".", repos = NULL, verbose = TRUE)
install.packages("src/rvest_0.3.1.zip", lib = ".", repos = NULL, verbose = TRUE)
library(httr, lib.loc=".", verbose=TRUE)
library(selectr, lib.loc=".", verbose=TRUE)
library(xml2, lib.loc=".", verbose=TRUE)
library(rvest, lib.loc=".", verbose=TRUE)

Hope this helps,

Roope

Answer 2

Hi Roope, it worked.

Since httr was already available within Azure ML, I din't include it... But as you suggested, once I added that, it worked. Thanks a lot. Marking this as an answer...

with regards,

Parthiban