internal/validators.js:117
    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
    ^

[TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
  at validateString (internal/validators.js:117:11)
  at Object.join (path.js:375:7)
  at Object.<anonymous> (C:\Users\lipengfei\AppData\Roaming\npm\node_modules\nrm\cli.js:17:20)
  at Module._compile (internal/modules/cjs/loader.js:1158:30)
  at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
  at Module.load (internal/modules/cjs/loader.js:1002:32)
  at Function.Module._load (internal/modules/cjs/loader.js:901:14)
  at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
  at internal/main/run_main_module.js:18:47
] {
  code: 'ERR_INVALID_ARG_TYPE'
}

处理方法：
打开nrm的安装文件，一般是在这个路径下：C:\Users*\AppData\Roaming\npm\node_modules\nrm，
找到cli.js文件的第17行，做如下修改
把第17注释掉添加下面的代码

// const NRMRC = path.join(process.env.HOME, '.nrmrc');
const NRMRC = path.join(process.env[(process.platform == 'win32') ? 'USERPROFILE' : 'HOME'], '.nrmrc');