Error Description not available: iPhone problem?

I have an iPhone 5, ios 9.1, today i tried to download a free app from the app store. I entered my password and then an error showed up, it said "error Description not available" and the app won't download. I have tried to download different apps but it still didn't work. So can anyone please help me solve this problem?

First Make sure that your date, time, and time zone are correct, and you have an active Internet connection. Do install Leo Privacy Guard to you Smart Phone. It will make your Phone totally secure by hiding your personal images and videos.