Hi! I'm getting an error message in Kopete (since I upgraded to KDE 4.2) and I really don't know what it is or what it does.
The only strange thing I notify is that the Nickname in the MSN account dissapear when it wants, and I have to write it again.

So, here it is:

Try installing and upgrading libmsn to the latest version available from the KDE 4.2 repository.

I'm using libmsn 4.0 Beta 4, is that the last one right?

That is the version I have installed. It is likely Microsoft have changed something to prevent Kopete from working. You may wish to check the libmsn developers mailing list. There may already be fixes on the way.