skipper gridfs image upload

Question

I'm having a problem in sails js image uploading using skipper gridfs.

My connection is fine but however when I upload an image it logs an error to my terminal

 MongoError: error processing query: ns=admin.uploads.chunksTree: $and
    files_id $eq ObjectId('5aa131bc2f0c2cda22b1b8ed')
    n $gte 0
Sort: { files_id: 1, n: 1 }
Proj: {}
 No query solutions

I'm using Kitematic.