React.createElement: type should not be null, undefined, boolean, or number

[IDragonfire]

Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Check the render method of `t`.

I get this error message with the example and only white page ...

React 15.4.0

Ps.:

[IDragonfire]

With react-bootstrap@0.28.5 it's looks better, but still not smooth ...