Bootstrap scaffolding is not working properly: span6 div goes to a new line after span6 div

Question

I placed two divs with a class span6 withing one div with class row. But as you can see in the screenshot the second div.span6 goes to a new line instead of float to the right of the previous div.span6:

As you can see the width of the div.span6 is 1130 pixels (seams like to be a full width of the parent).

Could you make clear what can be wrong?

Answer 1

What version of bootstrap are you using? Since Bootstrap 3 the grid system changed, and you should use for example col-sm-6.

Here's the latest grid system documentation http://getbootstrap.com/css/#grid