"Invalid scope" when requesting OAuth access token

Hey.

I'm trying to use oauth authentication on an external website using NodeJS with passport-oauth2. When passport-oauth2 requests an access token, the forum returns

Code:

{ statusCode: 400, data: '{"error":"invalid_scope"}' }

Here are the details of the request :
URL:

Code:

http://[forum address]/api/oauth/token

Headers:

Code:

{ 'Content-Type': 'application/x-www-form-urlencoded' }

POST params:

Code:

grant_type=authorization_code&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fauth%2Fxenforo%2Fcallback&client_id=[consumer key]&client_secret=[consumer secret]&code=490c237772e559cfe311771b2c3dc03b

 

Thanks! It works.