In trying to set the APN, i get the message "The application setting (process com.android.settings) has stopped unexpectedly. Please try again

You can try deleting your Gmail account and then reinstalling it.
good luck

Have you tried a factory reset? Its in Settings - Privacy - Factory Reset

Phone is getting an error message: "Unfortunately Launcher Has Stopped."
Unfortunately Launcher Has Stopped:

1. Swipe your finger from top to bottom on the screen to view the notification panel
2. Touch the Settings or
3. Touch Apps
4. Touch Menu or
5. Touch Reset App Preferences
6. Touch Reset Apps
7. Swipe from right to left 2-3 times to show the ALL list.
   (For device running on Android 6.0.X touch Menu then Show system)
8. Touch Launcher
   (For device running on Android 6.0.X touch Stock Android then Storage)
9. Touch Clear Data
10. Touch OK
11. Power Cycle Phone
12. Test phone

hope this isn't clear as mud. :) and helps you

the application wmtlancher (process com.wmt.lancher) has stopped unexpectedly.

I also had this problem. What I did was hooked my pandigital up to my computer and put videos on there that would take up alot of room. After I unplugged it I got a message saying that my memory was low. I clicked on the message and it showed me all the default applications instead of the applications I download. I clicked on my browser and pressed force stop and clear cache and it had worked fine. If you dont feel like doing all that work I suggest you download another browser such as Opera Mini or Dolphin Browser mini.

Link
phandroid.com/2008/10/25/how-to-reset-your-g1-and-start-from-scratch

"It came time to part with my review unit of the G1 (Thanks T-Mobile!) and send the phone back to its rightful owner. But what about all the personal info on the phone? The apps, texts, e-mails, AIMs and all that jazz? A quick search of AndroidForums.com turned up an easy way of restoring your G1 to factory settings:
if you power off your phone and hold the home (shaped like a house) and the end (red hangup button) for about 20 seconds you get a triangle with an exclamation point and a picture of the G1.
Now all you have to do is pop open that pretty QWERTY keyboard and there are several keyboard shortcuts you can use to accomplish what you want to do:
Home+Back reboot system now - (Soft Reboot)
Alt+L - Toggle log text display - (Toggles between the exclamation and menu options)
Alt+S - apply sdcard:update.zip - (Not brave enough yet)
Alt+W - Wipe data/factory reset - (What I chose, had to re-register, out of the box settings)
thee last option (Alt + W) and restored my borrowed G1 to factory settings. I'm sure the soft reboot could be helpful too, should you run into problems a troubled application may have caused. We didn't try the other 2 options so use at your own risk.
By the way, I couldn't live without a G1 so I made the leap and purcahsed a G1 with a T-Mobile service plan. I'm still a loyal Verizon customer and will simply have to keep both plans... but I NEEDED the G1. So basically, you can expect the application reviews and insight you've gotten at phandroid.com to cotinue since we've got our very own device now!
[Via Android Forums]

It is safe to select force close, however any unsaved work will be lost. Restart the application afterward.

You can restore your epad to factory settings by going to the settings menu > privacy > Factory data reset. and then your epad should be running normally again.