title: Can't update any plugins, not a valid cordova platform?
body: <p>I have an issue when trying to update any plugin in cordova using mac os terminal. When I try to run the command <code>cordova plugin add xxxxxxx</code> it is telling me that both my android/ios are not  valid cordova platforms.</p>
  
  <p>My Node version is v9.2.0, NPM version is 5.5.1 and Cordova version is 7.1.0. I'm at a loss on how to proceed. Can anyone give some insight? </p>
  
  <pre><code> ➜  steve git:(master) ✗ cordova plugin add https://github.com/danwilson/google-analytics-plugin.git
   Installing "cordova-plugin-google-analytics" for ios
   Unable to load PlatformApi from platform. Error: Cannot find module '/Users/rsteve/Desktop/steve/platforms/ios/cordova/Api.js'
  Failed to install 'cordova-plugin-google-analytics': Error [ERR_UNHANDLED_ERROR]: Unhandled error. (The platform "ios" does not appear to be a valid cordova platform. It is missing API.js. ios not supported.)
  at EventEmitter.emit (events.js:140:19)
  at EventEmitter.module.exports.emit (/usr/local/lib/node_modules/cordova/node_modules/cordova-common/src/events.js:71:17)
  at Object.getPlatformApiFunction (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/cordova/util.js:500:20)
  at Object.getPlatformApi (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/platforms/platforms.js:55:25)
  at handleInstall (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/install.js:593:29)
  at /usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/plugman/install.js:357:28
  at _fulfilled (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:787:54)
  at self.promiseDispatch.done (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:816:30)
  at Promise.promise.promiseDispatch (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:749:13)
  at /usr/local/lib/node_modules/cordova/node_modules/q/q.js:509:49
  </code></pre>
  
  <p>Error: Unhandled error. (The platform "ios" does not appear to be a valid cordova platform. It is missing API.js. ios not supported.)</p>
  
  <p><a href="https://i.stack.imgur.com/afi2J.png" rel="noreferrer"><img src="https://i.stack.imgur.com/afi2J.png" alt="enter image description here"></a></p>