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Grommet:TypeError:无法读取未定义的属性"modelSchemas"

我正在使用grommet版本1.3.4并尝试将mongodb与节点js和express一起使用.当我运行时,npm install我得到以下TypeError:

/home/jorge/Desktop/crud-app/node_modules/mongoose/lib/index.js:373
  if (!this.modelSchemas[name]) {
            ^

TypeError: Cannot read property 'modelSchemas' of undefined
    at Mongoose.model (/home/jorge/Desktop/crud-app/node_modules/mongoose/lib/index.js:373:13)
    at Object.<anonymous> (/home/jorge/Desktop/crud-app/dist-server/models/person.model.js:18:39)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Module.require (internal/modules/cjs/loader.js:650:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/jorge/Desktop/crud-app/dist-server/controllers/person.controller.js:9:15)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Module.require (internal/modules/cjs/loader.js:650:17)
[nodemon] app crashed - waiting for file changes before starting...

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这是我用于Person模式的代码: