diff --git a/weboob/applications/monboob/monboob.py b/weboob/applications/monboob/monboob.py
index 47b19e63..53925318 100644
--- a/weboob/applications/monboob/monboob.py
+++ b/weboob/applications/monboob/monboob.py
@@ -28,7 +28,7 @@ import sys
 import logging
 import asyncore
 
-from weboob.core.ouiboube import Weboob
+from weboob.core import Weboob, CallErrors
 from weboob.core.scheduler import Scheduler
 from weboob.capabilities.messages import ICapMessages, ICapMessagesPost, Thread, Message
 from weboob.tools.application.repl import ReplApplication
@@ -203,9 +203,17 @@ class Monboob(ReplApplication):
         self.weboob.loop()
 
     def process(self):
-        for backend, message in self.weboob.do('iter_unread_messages'):
-            self.send_email(backend, message)
-            backend.set_message_read(message)
+        try:
+            for backend, message in self.weboob.do('iter_unread_messages'):
+                self.send_email(backend, message)
+                backend.set_message_read(message)
+        except CallErrors, e:
+            for backend, error, backtrace in e.errors:
+                print >>sys.stderr, u'Error(%s): %s' % (backend.name, error)
+                if logging.root.level == logging.DEBUG:
+                    print >>sys.stderr, backtrace
+            if logging.root.level != logging.DEBUG:
+                print >>sys.stderr, 'Use --debug option to print backtraces.'
 
     def send_email(self, backend, mail):
         domain = self.config.get('domain')
diff --git a/weboob/tools/application/base.py b/weboob/tools/application/base.py
index 031f6902..7b660416 100644
--- a/weboob/tools/application/base.py
+++ b/weboob/tools/application/base.py
@@ -22,7 +22,7 @@ import optparse
 from optparse import OptionGroup, OptionParser
 
 from weboob.capabilities.base import NotAvailable, NotLoaded
-from weboob.core.ouiboube import Weboob
+from weboob.core import Weboob, CallErrors
 from weboob.tools.config.iconfig import ConfigError
 from weboob.tools.backend import ObjectNotAvailable
 
@@ -318,5 +318,12 @@ class BaseApplication(object):
             except ConfigError, e:
                 print 'Configuration error: %s' % e
                 sys.exit(1)
+            except CallErrors, e:
+                for backend, error, backtrace in e.errors:
+                    print >>sys.stderr, u'Error(%s): %s' % (backend.name, error)
+                    if logging.root.level == logging.DEBUG:
+                        print >>sys.stderr, backtrace
+                if logging.root.level != logging.DEBUG:
+                    print >>sys.stderr, 'Use --debug option to print backtraces.'
         finally:
             app.deinit()