We have investigated the issue and as of 17th April 2015, it looks like there is a networking issue with the Google causing this issue. Please follow the below steps to resolve the issue :

Goto Settings > Wi-Fi and next to your Wifi Network Name there should be a small blue i inside a circle, on the Right Hand side. Tap the small blue i

Then for DNS, enter in the value of

Then tap the < WIFI at the top of the screen which should Save the changes. 

Try using app again and it should work correctly from now on.