Debugging with Distel

Hi,
After a break with Erlang, I coming back.
Trying to debug with Distel, I have some troubles.
In the "EDB monitor" buffer, when I try to open the module of a breaked 
process, I got this message "No buffer for pid [TYPE erl-pid 
distel_5226@spock 16 0 0]".
Last messages in the *Message* buffer are
----
EXIT: <0.22.0> [emacs-error "(wrong-type-argument stringp nil)"]
   Process name: EDB Attach to process 51 on main@spock
or: No buffer for pid [TYPE erl-pid distel_5226@spock 22 0 0]
---

I'm sure that I missed something in my configuration.
This is my installation:
OS : Linux 2.6.17-10-generic #2 SMP Fri Oct 13 18:45:35 UTC 2006 i686 
GNU/Linux

OTP: R11B-2

Emacs: GNU Emacs 21.4.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll 
bars) of 2006-09-15 on rothera, modified by Debian



Regards,

Nicolas Charpentier


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