在验证失败时不显示错误信息?

I was expecting a flash notice when authentication failures occurs in devise. But get nothing during a authentication failure, just the page refreshes and remains still. I didn't change any stuffs. The default devise installation itself is not displaying flash errors with invalid authentication attempt. I just installed devise as a gem a tryed to uise it. Din't even change a word of the code that is generated.I was expecting a flash notice when authenticat