Why am I getting this error? I even typed it clean.
Did you check your browser zoom level? It should be set to 100%
If the 100% thing doesn't work try different browser.
Thank you, guys. I was using Chrome 48.0.2564.109 (64-bit) and yes, the zoom was 100% as advised. Nevertheless, it still didn't work. I did what dubstepshadow suggested and tried a different browser, Firefox 44.0.2. That did the trick.