Comment 12 for bug 234224

Yep, the dialog complained about preferences.rdb file. It seems like the "Google Talk" profile has been added incorrectly.
Below are (a little altered) changes that fixed this problem:

--- preferences.rdb.orig 2008-08-19 16:23:52.000000000 -0400
+++ preferences.rdb 2008-08-19 16:30:27.000000000 -0400
@@ -23,10 +23,7 @@
 *jprefs_gchat_colScheme: Naive
 *jprefs_autoLogin: 1
 *jprefs_ui_main_infoType: mejid
-*profiles: xxxx {...} {Google Talk} {
- gmail.com You from_gmail_your_account
- -ip talk.google.com -port 5223 -secure 1 -method ssl -digest 0
- }
+*profiles: xxxx {...} {Google Talk} { gmail.com You from_gmail_your_account -ip talk.google.com -port 5223 -secure 1 -method ssl -digest 0 }
 *selected_profile: xxxx
 *jprefs_status_menu: {away {}}
 *jprefs_subsc_auto: 1