Couchbase Ottoman nodejs Generic Error, Code:10

Question

I am trying to connect to couchbase using ottoman-node with the following code below.

ottoman.bucket = (new couchbase.Cluster(config.couchbase.test.server)).openBucket(config.couchbase.test.bucket, function (err) {
    if (err)
        console.log('Connection Error!', err);
        return;

    console.log('Connection Successful!');
});

But I get this error { CouchbaseError: Generic error message: 'Generic error', code: 10 }

Wha does this mean?