Is there accounts in ~/.mission-control/accounts/accounts.cfg when this happen?

Would be good if you could attach logs (help - debug) as well.

Which log you need?

I type info debug in terminal, but I didn't understand very much.
How I can give you a debug information?

in Empathy, open the help -> debug menu.

http://pastebin.com/nnARVrk1

Also, your debug is very useful, with pastebin integrated, and other beautiful things. Good work =)

Also, before all of this I get an error (by apport-gtk of ubuntu) telling me that telephaty failed with crash.

Indeed, looks like telepathy-mission-control is crashing. Could you report this crash using apport and link the crash report here?

*** Bug 675668 has been marked as a duplicate of this bug. ***

Sorry, I can't...apport-gtk is not working properly in gnome 3.4 (I already did a bug report to ubuntu). Only show the crash message but doesn't send the report.
I can do a screenshot with the details of the crash, if not other way possible to report.

Let's try to get a trace manually then:
- install telepathy-mission-control-5-dbg
- Quit Empathy
- killall -9 /usr/lib/telepathy/mission-control-5
- export MC_DEBUG=all
- gdb /usr/lib/telepathy/mission-control-5
- 'r' in gdb
- Reproduce the crash
- 'bt full'  in gdb
- attach the output

thanks!

um...I can't reproduce the error...it happens randomly. How about the screenshot of the repport-gtk details of crash?
Or another way to report just when crash?

If not, I do this each time I use empathy....but it is a annoying way to report. But if it the only way, no problem =)

Don't worry, I have the bug now with debug. I think it's a telepathy bug, please confirm and I will report in freedesktop.

http://pastebin.com/SfvUsND3

Is it possible that if telepathy fails, accounts-settings fails? If so, as I say, probably it is a telepathy bug.

Indeed, that's a telepathy-mission-control bug, please report to bugs.freedesktop.org