Errors during npm install

Try the following:

1. Delete folder node_modules

2. Delete file package-lock.json

3. Run npm install again

Errors when building Android app

Could not find an installed version of Gradle

If you get an error like this go to https://github.com/ionic-team/ionic/issues/11591 and do what is suggested there, installing gradle.

"Could not find an installed version of Gradle either in Android Studio, or on your system to install the gradle wrapper. Please include gradle in your path, or install Android Studio"

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