Activating dataview plugin ? No results

Things I have tried

Hello,
I just installed dataview plugin yesterday. So I changed some of my existing notes from basic markdown format metadatas to YAML.
When i tried a basic querie (LIST => all of my notes ?)…

ll

The editor tells me this…

The basics settings are untouched… I don’t undestand

What I’m trying to do

This should work …

```dataview
LIST
```