Cradle callback issue

gistfile1.txt

DreamModel.prototype.findAll = function(callback) {
  this.db.view('dream/all', function(err, res) {
    if (err) {
      console.log(err)
    } else {
      var docs = [];
      res.forEach(function (row) {
        docs.push(row);
      });
      callback(null, docs);
    }
  });
};

Returns this error:

/Users/xsyn/Development/didit.co.za/models/dreamModel.js:22
      callback(null, docs);
      ^
TypeError: string is not a function