Unfortunately app stopped on multiple apps

Question

My friend has a Nook, and has been playing games on it fine up until Monday. Now it won’t let her play FreeCell. I tested other apps, and most others also have the same issue (Firefox, Twitter, etc.). 

I receive a message that says “unfortunately app (it names it) stopped, and it goes back to the main screen.

I don’t own an Android device myself, so I am having trouble trying to fix it. I cleared the cache on every single app on her device, have force quit every single app, and turned off and on her device. None of those things have helped.

Another strange thing is that there was somehow another profile with her name on her device. She said she didn’t notice it until Monday. I thought that might be causing the issue, so I deleted the extra profile too. It didn’t help.

Not knowing what else to do, I am posting here. She is letting me borrow the device to see if I can figure out what is wrong with it.

When you reply to me, please walk me through everything, as I am not used to using androids.

James Watson · Answer

Try a factory reset after a full backup. Or in addition, wipe cache partition.
Good luck to you.

Arwen4CJ · Answer

How do I do that?

James Watson · Answer

Enter Recovery Mode, then select menu item 'Wipe data (factory reset)' as well as 'Wipe cache partition'.

Arwen4CJ · Answer

How do I enter recovery mode?

James Watson · Answer

Is your device a Barnes & Noble Nook Tablet?
Is it an ebook reader? Or is it also able to run any Android apps?

Abbas Shakhi · Answer

Don't try to run multiple programs. Lots of apps and games still run on the background, so you have to close all the programs and start running your main app. Hope it will be running fine and fast.

ericrawn · Answer

How to fix 'Unfortunately app has stopped' errors ? — 
One of the readers commented "My messaging app has been lagging, freezing and then 'Unfortunately App has stopped'. How can I solve this?" what are the steps to fix, Unfortunately, (App Name) Has Stopped. Why the app stops working suddenly? 

Its the month end and ever after the Android update, still, most of the popular errors are; unfortunately, app has stopped in android emulator, unfortunately, app has stopped solution, unfortunately, app has stopped android studio, "Unfortunately, WhatsApp has stopped", unfortunately, app has stopped Android solution, Unfortunately, Google play store has stopped, "Unfortunately, app has stopped Android development", "Unfortunately, app has stopped eclipse." 

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While running the Android, the custom interface crashes and people got the error "Unfortunately app has stopped error" or "Unfortunately, Process com.android.phone has stopped unexpectedly". 

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kalantos · Answer

A few months ago I ran into the same trouble. And I fix it with a factory reset.. Is not the best way but at least you can continue using the phone after redownloading everything