First, you must uninstall the current installation before applying any mods. Often several files require deleting: res/raw-apk/, res/layout/, AndroidManifest.xml. The easiest way to uninstall is with a root manager (like ES File Explorer). After uninstalling:
Go to system/app and delete com.outfit7.talkingangela, which should be all of your previous installations on your phone or tablet.
Try installing again.
If you still get the error, try clearing data from the Google Play Store app.
Most users report that it works for them after a reboot after applying a modded APK.