If you have iPhone, it may show a popup which will ask you to download an app but ignore it. I added it back in under settings. Then did a reboot of the iPad and after it was removed and rebooted.
Verify that you have entered the correct account info in Mail settings. To ensure there wasn't some sort of a conflict. In short, we do not know if the recent warming has affected the polar bears in a positive or negative way. Look for alert box saying something like Weve blocked a sign-in attempt or Someone has used your account. So, I was checking my emails and suddenly my gmail stopped working and I got the following error on my iPhone display. Then follow this guide to fix it. If youre using an iPhone, you may see a popup that asks you to download an appbut nows not the time. Open Safari, Chrome, or another internet browser, go to gmail. I have tried to correct the problem but it doesn't seem to help. Its better if you visit the Gmail website on desktop but it still works on your iPhone or iPad.