Hi,

I'm trying to execute this simple query from a tutorial:

sets = queryAE(keywords = "glioblastoma")

However, I get this error:

> pneumo = queryAE(keywords = "pneumonia")
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:02 --:--:--     0
Document is empty
Error: 1: Document is empty

I'm fairly new to Bioconductor. Is there something I'm doing wrong?

Thank you in advance for your help.

Probably not a problem on your end. The ArrayExpress API has changed to using JSON instead of XML, and it appears to have rendered the ArrayExpress package largely non-functional. The URI for the first query you attempted will be

https://www.ebi.ac.uk/arrayexpress/xml/v2/experiments?keywords=glioblastoma&species=

Which you can copy/paste into a browser. It will bring up the page that explains how to programmatically access ArrayExpress data rather than running the query you wanted.