Error registering models after upgrade to mongoose@2.1.2

[lionstone]

After I upgraded to mongoose 2.1.2, node crashes trying to register models with mongoose-admin:

TypeError: object is not a function
    at Schema.CALL_NON_FUNCTION_AS_CONSTRUCTOR (native)
    at new SchemaArray (/Users/lionstone/projects/colingo/express/node_modules/mongoose-admin/node_modules/mongoose/lib/schema/array.js:42:19)
    at Function.interpretAsType (/Users/lionstone/projects/colingo/express/node_modules/mongoose-admin/node_modules/mongoose/lib/schema.js:201:12)
    at Schema.path (/Users/lionstone/projects/colingo/express/node_modules/mongoose-admin/node_modules/mongoose/lib/schema.js:162:29)
    at Schema.add (/Users/lionstone/projects/colingo/express/node_modules/mongoose-admin/node_modules/mongoose/lib/schema.js:110:12)
    at new Schema (/Users/lionstone/projects/colingo/express/node_modules/mongoose-admin/node_modules/mongoose/lib/schema.js:38:10)
    at MongooseAdmin.registerModel (/Users/lionstone/projects/colingo/express/node_modules/mongoose-admin/lib/mongoose-admin.js:110:18)
    at Object.<anonymous> (/Users/lionstone/projects/colingo/express/models.js:141:7)
    at Module._compile (module.js:402:26)
    at Object..js (module.js:408:10)

Error only goes away when I dont register any models

Example code:

var TutorProfileModel = {
     username    : { type: String, index: true }
   , experience     : { type: String, default: '' }
   , bio      : { type: String, default: '' }
   , video_url : { type: String, default: '' }
   , comments : [TutorCommentSchema]
}
var TutorProfile = new Schema(TutorProfileModel)
mongoose.model('TutorProfile', TutorProfile);

var admin = mongoose_admin.createAdmin('mongodb://localhost/chat', { port : 3001 });
admin.registerModel('TutorProfile', TutorProfileModel, {list:['username','expreience','bio','video_url'], sort:['username']});