Non-ASCII string must be encoded in advance. user-full-name

[Maximilian Matthe]

Hi,

I have the following issue. I have this in my .gnus.el:
 
,----
| (setq user-full-name "Maximilian Matthé")
`----

Everytime I want to copy sth to the x-clipboard, emacs tells me:

,----
| Non-ASCII string must be encoded in advance: "Maximilian Matthé"
`----

In the message line. If I change my name to "Matthe" that does not
happen.

- my .gnus.el is saved in iso-8859-15 coding system. My default system
  locale is de_DE.utf-8.
- I use xubuntu 10.10. I pulled gnus at Dec 27.

Can you help me fixing that differently from changing my name?

Regards, Max