You can manually uninstall the app with steps below:

ROOT IS REQUIRED
 I am not responsible if you damage your phone, just follow steps below and nothing will happen.

1. Download a root file explorer like Root Browser from the play store.
2. Open the app.
3. Go to /data/app/.
4. Delete the apk of the app.
5. Check if also a directory of the app exists in /data/data/. If so, delete that directory. (The directory is the package name.)
6. Reboot your phone.
7. The app now should now be uninstalled.

You can manually uninstall the app with steps below:

ROOT IS REQUIRED 

I am not responsible if you damage your phone, just follow steps below and nothing will happen.

1. Download a root file explorer like Root Browser from the play store.
2. Open the app.
3. Go to /data/app/.
4. Delete the apk of the app.
5. Check if also a directory of the app exists in /data/data/. If so, delete that directory. (The directory is the package name.)
6. Reboot your phone.
7. The app now should now be uninstalled.