Cordova / Ionic：“ path”参数必须为字符串类型。接收类型未定义

Question

在尝试运行离子型$ ionic cordova build android时，出现以下错误：

““ path”参数必须为字符串类型。收到的类型未定义”

$ ionic info的输出如下。有人可以帮我解决这个问题吗？

   Ionic CLI                     : 5.4.6 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.9.0
   @angular-devkit/build-angular : 0.801.3
   @angular-devkit/schematics    : 8.1.3
   @angular/cli                  : 8.1.3
   @ionic/angular-toolkit        : 2.0.0

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 8.1.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.1, (and 7 other plugins)

Utility:

   cordova-res : not installed
   native-run  : 0.3.0 

System:

   ios-deploy : 1.9.4
   NodeJS     : v10.16.3 (/usr/local/bin/node)
   npm        : 6.11.3
   OS         : macOS High Sierra
   Xcode      : Xcode 10.1 Build version 10B61```