install mail application

so i did the update.

I tried opening the new application app in my menu tray and it would appear for half a second then disappear.

i then tried to old one and it said to...use the new app

well i opened and it the same thing happened. in my bottom dock tray the icon appears for half a second then disappears. no errors.

I ended up replacing the new app with the old one and now it gives the error to open the new one.

who knows what I did but someone help me simply

Install the mail app again so I can check my mail lol

thank you