definition is not executable

I use the latest version of this extension available. I also use the latest version of vs code.

I have put `.graphqlconfig` in the root directory of my project and that's how it looks:
```
{
  "schemaPath": "./schema.graphql",
  "exclude": ["./schema.graphql"]
}
```

I tried it without `exclude` also and still getting: 
`[GraphQL: Validation] the Whatever definition is not executable.`