3.0 update error message

This changes the following error message : 
![capture3](https://cloud.githubusercontent.com/assets/4977112/4177918/08d48dac-3668-11e4-90f3-4c3fca786fa1.PNG)

to this
![capture4](https://cloud.githubusercontent.com/assets/4977112/4177919/0fa13c2a-3668-11e4-8f9e-4ba8d862d600.PNG)

By the way, IMO it would make much more sense to display this error like this : 
![capture6](https://cloud.githubusercontent.com/assets/4977112/4177920/14ad1a68-3668-11e4-967e-2e8e81c52844.PNG)

as it would follow others error like 
![capture2](https://cloud.githubusercontent.com/assets/4977112/4177922/1c65450a-3668-11e4-8395-2b26555fb105.PNG)


Let me know if you agree with the last proposal and I'll update the PR.