Why can't I download pictures?

I can't seem to download pictures on my android 4.4.2. When I try to save from Chrome, it shows ''%1$s download failed due to an unknwon error'' and it's not a spelling error. It really shows that message. And when I try to download pictures from Tumblr app or Pinterest app, it doesn't download either. What's wrong? Help please :( I even have a lot of free space. Phone has about 6gb and sd card has about 12gb.

Welcome to Android Central! Which phone?

Go to Settings>Apps>All, select Download Manager, and Clear Cache/Clear Data, then Force Stop. Now try again.