error "cannot open the connection" while consuming published web service

[rquintino]

Hi, after successfully publishing a web service using the publishWebService AzureML function, consuming always result in error below ("cannot open the connection").

I had an identical error using the ml studio execute R script module, which I solved by switching to R Open 3.4.4.
question is: how to specify r open 3.4.4 on publishWebService?

tried using like this, but same error, didnt work:

options(repos = c(CRAN = "https://mran.revolutionanalytics.com/snapshot/2019-01-01"))

ep <- publishWebService(ws,
fun=xxxxxxx, name="my_model",
inputSchema = df,
data.frame = TRUE,
packages=c("quanteda"),
version="3.4.4")

Error
Error: AzureML returns error code:
HTTP status code : 400
AzureML error code : LibraryExecutionError

Module execution encountered an internal library error.
The following error occurred during evaluation of R script: R_tryEval: return error: Error in read.dcf(file = tmpf) : cannot open the connection