diff --git a/src/risotto/config.py b/src/risotto/config.py
index 63b4950..2ae56d1 100644
--- a/src/risotto/config.py
+++ b/src/risotto/config.py
@@ -4,10 +4,12 @@ from os import environ
 CONFIGURATION_DIR = 'configurations'
 TMP_DIR = 'tmp'
 DEFAULT_USER = environ.get('DEFAULT_USER', 'Anonymous')
-DEFAULT_DSN = environ.get('RISOTTO_DSN', 'postgres:///risotto?host=/var/run/postgresql/&user=risotto')
+DEFAULT_DSN = environ.get('DEFAULT_DSN', 'postgres:///risotto?host=/var/run/postgresql/&user=risotto')
 DEFAULT_TIRAMISU_DSN = environ.get('DEFAULT_TIRAMISU_DSN', 'postgres:///tiramisu?host=/var/run/postgresql/&user=tiramisu')
 MESSAGE_PATH = environ.get('MESSAGE_PATH', '/root/risotto-message/messages')
 SQL_DIR = environ.get('SQL_DIR', './sql')
+CACHE_ROOT_PATH = environ.get('CACHE_ROOT_PATH', '/var/cache/risotto')
+SRV_SEED_PATH = environ.get('SRV_SEED_PATH', '/srv/seed')
 
 
 def get_config():
@@ -22,8 +24,8 @@ def get_config():
                        'check_role': True,
                        'admin_user': DEFAULT_USER,
                        'sql_dir': SQL_DIR},
-            'source': {'root_path': '/srv/seed'},
-            'cache': {'root_path': '/var/cache/risotto'},
+            'source': {'root_path': SRV_SEED_PATH},
+            'cache': {'root_path': CACHE_ROOT_PATH},
             'servermodel': {'internal_source': 'internal',
                             'internal_distribution': 'last',
                             'internal_release_name': 'none'},
diff --git a/src/risotto/register.py b/src/risotto/register.py
index b3af396..80bf713 100644
--- a/src/risotto/register.py
+++ b/src/risotto/register.py
@@ -201,7 +201,7 @@ class RegisterDispatcher:
                     else:
                         missing_messages.append(message)
         if missing_messages:
-            raise RegistrationError(_(f'missing uri {missing_messages}'))
+            raise RegistrationError(_(f'no matching function for uri {missing_messages}'))
 
     async def on_join(self):
         internal_user = get_config()['global']['internal_user']