when upgrading to android-studio 3.4.x/gradle build plugin 3.4.x /gradle 5.3 ... wondering if its an issue with the android plugin.
ERROR: No value has been spe
This happened to me when I got a new laptop and did a fresh install of Android Studio.
I solved this by installing the proper Android SDK version that my project targets. Only API 29 was installed on my new machine when doing a fresh install of Android Studio, but my project targets API 28.
Open the SDK manager and download the proper Android SDK for your app and this error should resolve itself.