Error running npm/ionic commands - Cannot read property 'find' of undefined


I’m building an app in Ionic using Angular/Firebase.

I want to test the app on my android device, which, previously has worked perfectly. However, recently I’ve not been able to run it as I get an error.

$ ionic cordova run android --device --prod

Which then results in an error:

Running app-scripts build: --prod --platform android --target cordova
[15:36:05]  build prod started ...
[15:36:05]  clean started ...
[15:36:05]  clean finished in 6 ms
[15:36:05]  copy started ...
[15:36:06]  deeplinks started ...
[15:36:06]  deeplinks finished in 270 ms
[15:36:06]  ngc started ...
[15:36:19]  ngc finished in 12.61 s
[15:36:19]  preprocess started ...
[15:36:19]  preprocess finished in 1 ms
[15:36:19]  webpack started ...
[15:36:19]  copy finished in 13.84 s
[15:37:27]  webpack finished in 68.39 s
[15:37:27]  uglify started ...
[15:37:27]  sass started ...
Without `from` option PostCSS could generate wrong source map and will not find Browserslist config. Set it to CSS file path or to `undefined` to prevent this warning.
[15:37:29]  sass finished in 1.66 s
[15:37:29]  cleancss started ...
[15:37:31]  cleancss finished in 2.77 s
[15:37:56]  uglify finished in 28.99 s
[15:37:56]  postprocess started ...
[15:37:56]  postprocess finished in 25 ms
[15:37:56]  lint started ...
[15:37:56]  build prod finished in 110.64 s
> cordova run android --device
Android Studio project detected

(node:64964) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'find' of undefined
    at Object.resolveParent (C:\Users\Simon K\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-common\src\util\xml-helpers.js:207:26)
    at C:\Users\Simon K\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:345:53
    at Array.forEach (<anonymous>)
    at is_conflicting (C:\Users\Simon K\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:337:17)
    at PlatformMunger.add_config_changes (C:\Users\Simon K\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-common\src\ConfigChanges\ConfigChanges.js:188:33)
    at C:\Users\Simon K\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\cordova\prepare.js:130:32
    at _fulfilled (C:\xampp\htdocs\project x\anonymous-social\platforms\android\cordova\node_modules\q\q.js:854:54)
    at self.promiseDispatch.done (C:\xampp\htdocs\project x\anonymous-social\platforms\android\cordova\node_modules\q\q.js:883:30)
    at Promise.promise.promiseDispatch (C:\xampp\htdocs\project x\anonymous-social\platforms\android\cordova\node_modules\q\q.js:816:13)
    at C:\xampp\htdocs\project x\anonymous-social\platforms\android\cordova\node_modules\q\q.js:624:44
(node:64964) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:64964) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I’m not sure why this is happening. I tried removing my node_modules folder and then doing npm install, but that didn’t fix it. I think it could possibly be an android issue? As I’m still able to build on iOS

Any ideas? Thank you!!


Managed to (temporarily?) fix this issue by removing android and reinstalling…

cordova platform remove android
cordova platform add android

hope this can help someone in the future.