problema em aplicar versões diferentes

Eu estou conciliando minhas aulas do Alura com uma que eu comprei da Udemy. Porém, os professores de lá só dão a resposta para os Alunos no inicio ( grande diferencial do Alura, os professores sempre acompanham seu progresso). Cheguei em um ponto que não sei o que pode ser o erro: Era pra ter funcionado o controle de versão.

import{ModelRouter} from '../common/model-router'
import * as restify from 'restify'
import{NotFoundError} from 'restify-errors'
import{User} from './usuarios.model'

class UsersRouter extends ModelRouter<User> {

  constructor(){
    super(User)
    this.on('beforeRender', document=>{
      document.password = undefined
    })
  }

  findByEmail = (req, resp, next)=>{ // fazendo busca por email
    if(req.query.email){ // se meu email estiver na busca 
      User.find({email:req.query.email})
      .then(this.renderAll(resp, next))
      .catch(next)
    }else{
       next()
    }
  }

  applyRoutes(application: restify.Server){


    application.get({path:'/usuarios', version: '2.0.0'},[this.findByEmail, this.findAll])
    application.get({path:'/usuarios', version: '1.0.0'},this.findAll) // desse modo por padrão
    application.get('/usuarios/:id',[this.validateId, this.findById])
    application.post('/usuarios', this.save)
    application.put('/usuarios/:id',[this.validateId, this.replace])
    application.patch('/usuarios/:id',[this.validateId, this.update])
    application.del('/usuarios/:id',[this.validateId, this.delete])
  }
}

export const usersRouter = new UsersRouter()

desse jeito. Mostra o seguinte erro no meu nodemon:

(node:7964) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
(node:7964) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
Server failed to start
{ AssertionError [ERR_ASSERTION]: Method 'GET' already declared for route '/usuarios'
    at Router._insert (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\node_modules\find-my-way\index.js:275:9)
    at Router._on (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\node_modules\find-my-way\index.js:177:8)
    at Router.on (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\node_modules\find-my-way\index.js:66:8)
    at RouterRegistryRadix.add (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\node_modules\restify\lib\routerRegistryRadix.js:42:21)
    at Router.mount (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\node_modules\restify\lib\router.js:212:20)
    at Server.serverMethod [as get] (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\node_modules\restify\lib\server.js:1659:33)
    at UsersRouter.applyRoutes (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\dist\usuario\usuarios.router.js:24:21)
    at Promise (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\dist\server\server.js:25:28)
    at new Promise (<anonymous>)
    at Server.initRoutes (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\dist\server\server.js:15:16)
    at initializeDb.then (C:\Users\YuriPNP\Desktop\nail-hear\tentativa-2\dist\server\server.js:38:52)
    at processTicksAndRejections (internal/process/next_tick.js:81:5)
  generatedMessage: false,
  name: 'AssertionError [ERR_ASSERTION]',
  code: 'ERR_ASSERTION',
  actual: false,
  expected: true,
  operator: '==' }
[nodemon] app crashed - waiting for file changes before starting...

Porém, quando eu retiro as duas versões, esse erro some:

import{ModelRouter} from '../common/model-router'
import * as restify from 'restify'
import{NotFoundError} from 'restify-errors'
import{User} from './usuarios.model'

class UsersRouter extends ModelRouter<User> {

  constructor(){
    super(User)
    this.on('beforeRender', document=>{
      document.password = undefined
    })
  }

  findByEmail = (req, resp, next)=>{ // fazendo busca por email
    if(req.query.email){ // se meu email estiver na busca 
      User.find({email:req.query.email})
      .then(this.renderAll(resp, next))
      .catch(next)
    }else{
       next()
    }
  }

  applyRoutes(application: restify.Server){



    application.get({path:'/usuarios', version: '1.0.0'},this.findAll) // desse modo por padrão
    application.get('/usuarios/:id',[this.validateId, this.findById])
    application.post('/usuarios', this.save)
    application.put('/usuarios/:id',[this.validateId, this.replace])
    application.patch('/usuarios/:id',[this.validateId, this.update])
    application.del('/usuarios/:id',[this.validateId, this.delete])
  }
}

export const usersRouter = new UsersRouter()

dessa forma funciona, e não faço ideia do pq. Alguém pode me ajudar( tenho um projeto que tá dando mesmo erro disponibilizado no github)