Execution failed for task \':app:processDebugResources\'.
This error comes when execute \"ionic cordova build android\". Searched for a long time but no luck. Anyone can
Solution link
This is due to compat plugin. Remove that plugin if you have older version (less than 1.2.0) and set cordova-android@6.3.0
cordova plugin rm cordova-plugin-compat --force
cordova plugin add cordova-plugin-compat@1.2.0
cordova platform rm android
ionic cordova platform add android@6.3.0
Working at my case. Thanks :)