When I tried logging in to my Yahoo Mail today, I got the Yahoo Mail Error Code 5. Googling for it says that it is caused by multiple tabs opened in my browser. So, I closed all the browser tabs, cleared the cache and opened Yahoo Mail again. Still, Yahoo Mail Error Code 5 appeared.
So, I tried a different browser. I used Google Chrome. But after logging in, Yahoo Mail Error Code 5 still appeared. I’m sure there’s no other tabs open. So, I tried contacting their technical support. But before I even started filling up their tech support form, I saw an advisory. It says that they are currently migrating all the Yahoo Mails, causing the error and it will be fixed as soon as possible.
After around 10 minutes, everything went back to normal. So, that’s how you fix Yahoo Mail Error Code 5. Just wait for it to fix itself.