Order is important.

modoboa/admin/migrations/0015_move_passwords.py

@@ -5,12 +5,15 @@ from south.v2 import DataMigration
 from django.db import models
 from modoboa.lib.models import Parameter
 from modoboa.lib.compat import user_model_name
+from modoboa.lib.dbutils import db_table_exists
 
 
 class Migration(DataMigration):
 
     def forwards(self, orm):
         "Write your forwards methods here."
+        if not db_table_exists("lib_parameter"):
+            return
         try:
             s = Parameter.objects.get(name='admin.PASSWORD_SCHEME').value
         except Parameter.DoesNotExist:

modoboa/core/templates/settings.py

@@ -138,19 +138,21 @@ INSTALLED_APPS = (
     # 'django.contrib.admindocs',
     'reversion',
     'south',
-    'modoboa',
-    'modoboa.auth',
-    'modoboa.lib',
 
     # Extra tools
     # 'modoboa.tools.pfxadmin_migrate',
 )
 
-MODOBOA_EXTENSIONS = (
+# A dedicated place to register Modoboa applications
+# Do not delete it.
+# Do not change the order.
+MODOBOA_APPS = (
+    'modoboa',
+    'modoboa.auth',
     'modoboa.admin',
+    'modoboa.lib',
     'modoboa.userprefs',
 
-    # Modoboa extensions here.
     'modoboa.extensions.limits',
     'modoboa.extensions.postfix_autoreply',
     'modoboa.extensions.webmail',
@@ -159,7 +161,7 @@ MODOBOA_EXTENSIONS = (
     'modoboa.extensions.sievefilters',
 )
 
-INSTALLED_APPS += MODOBOA_EXTENSIONS
+INSTALLED_APPS += MODOBOA_APPS
 
 AUTH_USER_MODEL = 'admin.User'
 

modoboa/extensions/__init__.py

@@ -56,7 +56,7 @@ class ExtensionsPool(object):
     def load_all(self):
         from modoboa.admin.models import Extension
 
-        for ext in settings.MODOBOA_EXTENSIONS:
+        for ext in settings.MODOBOA_APPS:
             __import__(ext)
         result = []
         for extname in self.extensions.keys():