IOS 9.0 update failed for me - Apple says keep patience

Quite funny to be waiting for the whole day and coincidentially my room mate said that the iphone ios 9.0 update will error out and it actually did! I'm frustrated but still patient enough. already found apple's tweet that says due to the overwhelming high number of users downloading the update it will take a bit patience but it will work. 

Here is the error image -