Keep getting invalid password in Visual Voicemail on LG phone

After switching to LG G2 phone, I kept getting Invalid password popup but when I open Voice Mail app, there is no option to change the password. I know my voice mail password is correct because I could retrieve the voice messages by dialing into the mailbox.

The solution:

1. On home screen, click on settings icon, and tab Application manager.
2. Swipe the screen to the right and show ALL
3. Swipe down till the Voice mail and tab it
4. Click on "Clear data" then "Force stop"
5. Go back to the Voice mail app, it should allow you to reconnect.