I have problems logging in

I have a very strange problem when I was going to log in with my Minecraft game everything is normal but in the end it tells me that there is a login error so there is no problem I thought it was my wifi but I had to log out and log in again I did what i had to do then i had that same error so i want you to fix it thank you very much.

I know my game is in Spanish but you know what I'm talking about