Hi, sorry for the late reply.
It seems that the warning is caused by your servers php setup.
Here someone had a similar problem:
https://stackoverflow.com/questions/6918623/curlopt-followlocation-cannot-be-activated
As I need to use cURL for reading in the Google Books you will need to “Set safe_mode = Off in your php.ini file (it’s usually in /etc/ on the server). If that’s already off, then look around for the open_basedir stuff in the php.ini file, and change it accordingly.”
I hope this helps and that you do have access to these files.
Thank you for informing me of this possible error.