My Vizio TV tells me, when I press the menu button, that it's unable to launch com.yahoo.widgets.tv.container. It worked fine last night.

Question edited for clarity.

It will only work if it is a Smart TV.

https://support.vizio.com/s/article/Alexa-SmartCast-Display?language=en_US


Getting Started:
Press the VIZIO button or Home button on your remote to launch SmartCast Home on your TV.From the top menu, navigate to Extras and click OK.Highlight and Select "VIZIO Account" and connect your TV to your VIZIO Account by following the on screen instructions. ...Highlight and Select "Smart Home Settings"More items...
How to Use Amazon Alexa Devices with your SmartCast TV
..

Follow these steps to reset your TV:

1. Unplug power to your router.
2. Perform a Clear Memory or Reset to Default on the TV.

A. Using the VIZIO remote, press the Menu button.
B. Use the Arrow buttons on the remote to highlight System and press OK.
C. Highlight Reset & Admin and press OK.
D. Highlight Reset TV to Factory Defaults and press OK.
E. If you have not manually reset the parental code, please input 0 0 0 0 when it asks for the password.
F. Highlight Reset and press OK.
G. Wait for the TV to turn off.
The TV will turn back on and the Setup App process will begin.

1. Plug power back to router.
2. Perform the setup process and reconnect to your network.

Hello
Just Follow these steps:
1.Verify that your Vizio Smart TV is connected to the Internet using a wireless or wired connection.
2.Power on your television and press the "V" button on your remote.This will access the App Bar.
3.Use the arrow keys on your remote to highlight either the Yahoo TV Store or CTV Store.
4.Press "OK" to launch the app store.

For any help or support just visit us: Hbo Go Support

Have you checked the TV without other devices connected to the TV.
Eg. disconnect any home theatre or speakers from the TV.

Verify with audio menu if the settngs of TV speakers is on or off ?
To adjust the audio settings:
1. Press the menu button on the remote. The on-screen menu
is displayed.
2. Use the arrow buttons on the remote to highlight audio and press ok. The AUDIO menu is displayed.
3. Use the arrow buttons to highlight the setting you wish to adjust, then press left/right arrow buttons to change the setting:
• TV speakers - Turns the built-in speakers on or off.

Lastly have you tried restoring the TV to factory default settings.
To restore the TV to its factory default settings:
1. Press the menu button on the remote. The on-screen menu is
displayed.
2. Use the arrow buttons on the remote to highlight system
and press ok. The SYSTEM menu is displayed.
3. Highlight reset & admin and press ok. The RESET & ADMIN
menu is displayed.
4. Highlight reset TV to factory defaults and press ok.
5. If you have changed the default parental control passcode,
enter it now.
The TV displays, "Select Reset to restore all TV settings to
factory defaults and clear all account information."
6. Highlight reset and press ok.
7. Wait for the TV to turn off. The TV will turn back on shortly
afterward and the Setup App will begin

It's not
Widget Gallary anymore, its Yahoo connected TV Store

Funny, same thing happened to me about the same time! Took me a while to figure out how to fix it. You have to get to the HDTV Settings menu and hit the Help icon. Do a Clear Memory/(Factory Default) and go thru that process, basically you go through all the settings just as you did the first time you powered up the TV. This will fix your problem.

The challnge is...how to get to the HDTV Settings menu when your VIA button only brings up the error you described? I finally got there like this: Hit the "Input" button on the remote, navigate to "TV" and hit OK (basically just select TV as your input), hit the Menu button on the remote and that will bring up the HDTV Settings menu and then proceed as above

Well i just want to start off linking you the link to your tvs manual in case you have lost it

vizio VW37L HDTV20A User Manual
YOUR TVS MANUAL

vizio contact info if im unable to assist.
For assistance, please call (949) 428-2525 or email
us at [email protected].

IF its not the parental password option this will work


Under the Menu
Reset All Settings
Press Down the button to highlight the Reset All Settings selection.
Press Arrow poiting right button to reset the TV to the default factory settings.
Press either the MENU button to return to the previous menu display or the LAST key to return to your
program if task has been completed.
Note: This does NOT reset the Parental Control Password.

Their is no instructions on how to reset this.

You can always turn your TV off, unplug it from the electrical outlet, wait for 30 seconds or so, plug it back in, then turn it back on. If you have kids check the menu options to see if they may have tampered with it unintentionally. If all else fails, call Vizio and ask for their professional help. If you are not satisfied with their help and assistance, make a complaint by going to BBB.org (Better Business Bureau). Maybe if you tell Vizio that you're going to call the BBB then they might take you a little more seriously.