error message : the path isn't correct.

After the latest update, i keep getting an error message that the path isn't correct. In the path my name is not correct.
It should be "Sinéad05", but it says "Sin?ad05"(see attachment).
I'm playing minecraft on my laptop for allmost 2 years.
It has never been a problem until the latest update.
I hope you're able to fixe it.

Greetings

Sinéad