Sorry, but you either have no stories or none are selected somehow.
If the problem persists, check the browser console, or the terminal you've run Storybook from.
console.log('Hello, World!');
{
"blocks": [
{
"text": "Sometimes #hashtags are useful."
},
{
"text": "console.log('Hello, World!');",
"type": "code-block"
}
],
"entityMap": {}
}