can't access /chat/_persona

CouchChat-config.js

{
  "log": ["CRUD", "REST+"],
	"databases": {
		"chat": {
      "browserid" : {
        "origin" : "http://mineral.local:4984/"
      },

      "users": {
        "GUEST": {"disabled": true},
        "push" : {"name":"push","password":"secret","admin_channels":["*"]}
      },
			"sync": `

function(doc, oldDoc, userCtx, secObj) {
  if (doc.channel_id) {
    // doc belongs to a channel
    channel("ch-"+doc.channel_id)
    channel("push") // all channel docs go to push notifications
    // this document describes a channel
    if (doc.channel_id == doc._id) {
      // magic document, treat it carefully
      if (oldDoc && oldDoc.owners.indexOf(userCtx.name) == -1) {
        throw({unauthorized:"you are not a channel owner"});
      }
      if (!Array.isArray(doc.owners)) {
        throw({forbidden : "owners must be an array"})
      }
      // grants access to the channel to all members and owners
      access(doc.owners, "ch-"+doc._id);
      if (Array.isArray(doc.members)) {
        access(doc.members, "ch-"+doc._id);
      }
    }
  }
  if (doc.type == "profile") {
    channel("profiles");
    var user = doc._id.substring(doc._id.indexOf(":")+1);
    if (userCtx.name != user) {
      throw({unauthorized : "you can only edit your own profile"});
    }
    access(user, "profiles");
  }
}

`
		}
	}
}