curl::curl_fetch_memory

Hi.
I m using rdrop2 on a ec3 running a shiny-server on ubuntu 16.04 64 bits and R version 3.3.3 . Everything was running smoothly, then I made a feel changes to the app, tested locally (it was and still is everything ok), commited to my server, but then the app don't load anymore. I've tried to undo all my changes, but apparently it isn't related to them. Then I commented the section where I was using rdrop2, and the app loaded again on the server.

This is the section that is causing the problem:
```
library(rdrop2)
tesT=readRDS("data/test.rds")
data=drop_read_csv("shiny/autismo/data/dados.csv",dtoken=tesT)
gruposcsv=drop_read_csv("shiny/autismo/data/grupos.csv",dtoken=tesT)
```

This is my last logfile:
Warning: Error in curl::curl_fetch_memory: Failure when receiving data from the peer
Stack trace (innermost first):
49: curl::curl_fetch_memory
48: request_fetch.write_memory
47: request_fetch
46: request_perform
45: httr::GET
44: drop_dir_internal
43: drop_exists
42: drop_get
41: drop_read_csv
1: runApp
Error : An error has occurred. Check your logs or contact the app author for clarification.

Any idea about how can I fix this?