Wifi client Xibely

I got to connect my wifi shield to Xibely datalogger and even to send some sensor data, but after a few iterations, I recieve the message "No sockets available".

I am just using the example "WiFi Xively Client String" in the Arduino webpage.

Where is the problem?

I hope someone from Arduino helps me, and to the rest of the comunity fixing any possible bug. Thank you, Josu