error ==> no_usable_index: Database encountered an unknown error

gistfile1.txt

var db = new PouchDB(cloudantURL);

db.createIndex({
    index: {
        fields: ['_id'],
        name: 'addressesIndex',
        ddoc: 'addressesddoc',
        type: 'json'
    }
})
    .then(function (result) {
        console.log("--Index:",result);
        return db.find({
            selector: {
                geometry: {'$exists': true}
            },
            fields: ['_id', 'geometry', 'geohash'],
            sort: ['_id']
        });
    })
    .then(function (result) {
        console.log(result);
        // yo, a result
    })
    .catch(function (err) {
        console.log(err);
        // ouch, an error
    });