Failure [INSTALL_FAILED_DEXOPT] on Android Studio
If you want run your app within the android studio emulator, maybe you will see this message:
Installation failed since the device possibly has stale dexed jars that don't match the current version (dexopt error).
In order to proceed, you have to uninstall the existing application.
WARNING: Uninstalling will remove the application data!
Do you want to uninstall the existing application?
Don't worry, you can fix it. Go to Android Virtual Device Manager and click on Wipe Data.