Error with url in local databases

[DimShadoWWW]

I'm using app-pouchdb-sync to upload documents from local database to remote couchdb using this code in src/my-app.html :

    <app-pouchdb-sync src="localdb" target="http://username:password@db.example.com/remotedb" bidirectional="">
    </app-pouchdb-sync>

and in the web console keeps appearing this errors:

https://site.example.com/src/localdb/ 404 ()

like if src were a "remote database"

I'm using pouchdb-5.3.2 and app-pouchdb-0.9.1