diff --git a/src/yunohost/app.py b/src/yunohost/app.py
index 5e7860992..96c235835 100644
--- a/src/yunohost/app.py
+++ b/src/yunohost/app.py
@@ -1296,7 +1296,7 @@ def app_checkurl(auth, url, app=None):
                 raise MoulinetteError('app_location_already_used', app=a["id"], path=path)
             # can't install "/a/b/" if "/a/" exists
             elif path.startswith(p) or p.startswith(path):
-                raise MoulinetteError('app_location_install_failed', other_path=p, other_app=a['id'))
+                raise MoulinetteError('app_location_install_failed', other_path=p, other_app=a['id'])
 
     if app is not None and not installed:
         app_setting(app, 'domain', value=domain)
@@ -1618,7 +1618,7 @@ def app_config_apply(app, args):
 
     installed = _is_installed(app)
     if not installed:
-        raise MoulinetteError('app_not_installed', app=app_id)
+        raise MoulinetteError('app_not_installed', app=app)
 
     config_panel = os.path.join(APPS_SETTING_PATH, app, 'config_panel.json')
     config_script = os.path.join(APPS_SETTING_PATH, app, 'scripts', 'config')
diff --git a/src/yunohost/dyndns.py b/src/yunohost/dyndns.py
index cda55f5e0..93f3a7a38 100644
--- a/src/yunohost/dyndns.py
+++ b/src/yunohost/dyndns.py
@@ -127,8 +127,7 @@ def dyndns_subscribe(operation_logger, subscribe_host="dyndns.yunohost.org", dom
 
     # Verify if domain is provided by subscribe_host
     if not _dyndns_provides(subscribe_host, domain):
-        raise MoulinetteError(m18n.n('dyndns_domain_not_provided',
-                                     domain=domain, provider=subscribe_host))
+        raise MoulinetteError('dyndns_domain_not_provided', domain=domain, provider=subscribe_host)
 
     # Verify if domain is available
     if not _dyndns_available(subscribe_host, domain):
diff --git a/src/yunohost/user.py b/src/yunohost/user.py
index c8aee153f..67cfe6cf1 100644
--- a/src/yunohost/user.py
+++ b/src/yunohost/user.py
@@ -71,7 +71,7 @@ def user_list(auth, fields=None):
             if attr in keys:
                 attrs.append(attr)
             else:
-                raise MoulinetteError('field_invalid', attrz1)
+                raise MoulinetteError('field_invalid', attr)
     else:
         attrs = ['uid', 'cn', 'mail', 'mailuserquota', 'loginShell']
 
@@ -140,7 +140,7 @@ def user_create(operation_logger, auth, username, firstname, lastname, mail, pas
     ]
 
     if mail in aliases:
-        raise MoulinetteError(errno.EEXIST,m18n.n('mail_unavailable'))
+        raise MoulinetteError('mail_unavailable')
 
     # Check that the mail domain exists
     if mail.split("@")[1] not in domain_list(auth)['domains']:
@@ -326,7 +326,7 @@ def user_update(operation_logger, auth, username, firstname=None, lastname=None,
             raise MoulinetteError(m18n.n('mail_domain_unknown',
                                          domain=mail[mail.find('@') + 1:]))
         if mail in aliases:
-            raise MoulinetteError(errno.EEXIST,m18n.n('mail_unavailable'))
+            raise MoulinetteError('mail_unavailable')
 
         del user['mail'][0]
         new_attr_dict['mail'] = [mail] + user['mail']
@@ -337,8 +337,7 @@ def user_update(operation_logger, auth, username, firstname=None, lastname=None,
         for mail in add_mailalias:
             auth.validate_uniqueness({'mail': mail})
             if mail[mail.find('@') + 1:] not in domains:
-                raise MoulinetteError(m18n.n('mail_domain_unknown',
-                                             domain=mail[mail.find('@') + 1:]))
+                raise MoulinetteError('mail_domain_unknown', domain=mail[mail.find('@') + 1:])
             user['mail'].append(mail)
         new_attr_dict['mail'] = user['mail']