diff --git a/weboob/backend.py b/weboob/backend.py
index 0b2908b7..de86f76b 100644
--- a/weboob/backend.py
+++ b/weboob/backend.py
@@ -54,10 +54,10 @@ class Backend(object):
             value = config.get(name, field.default)
 
             if value is None:
-                raise Backend.ConfigError("Missing parameter '%s' (%s)" % (name, field.description))
+                raise Backend.ConfigError('Missing parameter "%s" (%s)' % (name, field.description))
 
             if field.regexp and re.match(field.regexp, str(value)):
-                raise Backend.ConfigError("Value of '%s' does not match regexp '%s'" % (name, field.regexp))
+                raise Backend.ConfigError('Value of "%s" does not match regexp "%s"' % (name, field.regexp))
 
             if not field.default is None:
                 if isinstance(field.default, bool):
diff --git a/weboob/modules.py b/weboob/modules.py
index a73f3d99..44204c81 100644
--- a/weboob/modules.py
+++ b/weboob/modules.py
@@ -94,7 +94,7 @@ class BackendsConfig:
             try:
                 yield name, params.pop('_type'), params
             except KeyError:
-                warning("Missing field '_type' for backend '%s'", name)
+                warning('Missing field "_type" for backend "%s"', name)
                 continue
 
     def add_backend(self, name, _type, params):
@@ -130,10 +130,10 @@ class ModulesLoader:
         try:
             module = Module(name, __import__(name, fromlist=[name]))
         except ImportError, e:
-            warning('Unable to load module %s: %s' % (name, e))
+            warning('Unable to load module "%s": %s' % (name, e))
             return
         if name in self.modules:
             warning('Module "%s" is already loaded (%s)' % self.modules[name].module)
             return
         self.modules[module.get_name()] = module
-        debug('Loaded module %s (%s)' % (name, module.module.__name__))
+        debug('Loaded module "%s" (%s)' % (name, module.module.__name__))
diff --git a/weboob/ouiboube.py b/weboob/ouiboube.py
index 4e279406..77a6643a 100644
--- a/weboob/ouiboube.py
+++ b/weboob/ouiboube.py
@@ -42,7 +42,7 @@ class Weboob:
         if not os.path.exists(self.workdir):
             os.mkdir(self.workdir)
         elif not os.path.isdir(self.workdir):
-            warning("'%s' is not a directory" % self.workdir)
+            warning('"%s" is not a directory' % self.workdir)
 
         # Modules loader
         self.modules_loader = ModulesLoader()
@@ -60,7 +60,7 @@ class Weboob:
             try:
                 module = self.modules_loader.modules[_type]
             except KeyError:
-                warning('Unable to find module %s', name)
+                warning('Unable to find module "%s" for backend "%s"' % (_type, name))
                 continue
 
             # Check conditions
@@ -71,7 +71,7 @@ class Weboob:
             try:
                 self.backends[name] = module.create_backend(self, name, params)
             except Exception, e:
-                warning('Unable to load %s backend: %s' % (name, e))
+                warning('Unable to load "%s" backend: %s. filename=%s' % (name, e, self.backends_config.confpath))
 
         return self.backends
 
@@ -82,7 +82,7 @@ class Weboob:
                 try:
                     self.backends[module.name] = module.create_backend(self, module.name, {})
                 except Exception, e:
-                    warning('Unable to load %s backend: %s' % (name, e))
+                    warning('Unable to load "%s" module as backend with no config: %s' % (name, e))
         return self.backends
 
     def iter_backends(self, caps=None):