Unexpected data value while parsing

I'm trying to pass a `filter` prop set to `Interest` to a `FilterPoint` component from inside a markdown file. Here's my code:

```
..FilterPoint
---
filter: Interest
---
```

And here's my config:

```
{
directives: {
FilterPoint: {
component: {
source: './components/stackedbar/FilterPoint.js'
}
}
}
}
```

This is triggering the following error:

```
ERROR in ./contents/frontend/results.md
Found an unexpected data value while parsing ..FilterPoint directive at line 6 column 1
```

Any idea?