wordpress user sync not working!! error 401 log

Hello,

i have a problem with plugin "user sync" wordpress. i have multisite. i would like clone user (domaine 1 : http://annesophieduval.com/ASD) on domain 2 : http://annesophieduval.com/ASD/en/)

my error log "errors_s.log"

[2014-09-05 09:32:06][S] 01 - new subsite conection - central_url=http://www.annesophieduval.com/ASD;; replace_user=1;; overwrite_user=1;;***
[2014-09-05 09:32:06][S] 02 - sending request - url=http://www.annesophieduval.com/ASD/wp-admin/admin-ajax.php?action=user_sync_api;;***
[2014-09-05 09:32:06][S] 03 - sending request - response=<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>401 Authorization Required</title>
</head><body>
<h1>Authorization Required</h1>
<p>This server could not verify that you
are authorized to access the document
requested. Either you supplied the wrong
credentials (e.g., bad password), or your
browser doesn't understand how to supply
the credentials required.</p>
<hr>
<address>Apache Server at http://www.annesophieduval.com Port 80</address>
</body></html>
;;***
[2014-09-05 09:42:35][S] 01 - new subsite conection - central_url=http://www.annesophieduval.com/ASD;; replace_user=1;; overwrite_user=1;;***
[2014-09-05 09:42:35][S] 02 - sending request - url=http://www.annesophieduval.com/ASD/wp-admin/admin-ajax.php?action=user_sync_api;;***
[2014-09-05 09:42:35][S] 03 - sending request - response=<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>401 Authorization Required</title>
</head><body>
<h1>Authorization Required</h1>
<p>This server could not verify that you
are authorized to access the document
requested. Either you supplied the wrong
credentials (e.g., bad password), or your
browser doesn't understand how to supply
the credentials required.</p>
<hr>
<address>Apache Server at http://www.annesophieduval.com Port 80</address>
</body></html>
;;***

after i had this log "errors_m.log"

[2014-09-05 11:56:09][M] 0-10 - ajax actions***
[2014-09-05 11:56:09][M] 07 - added new sub site***
[2014-09-05 11:57:34][M] 0-10 - ajax actions***
[2014-09-05 11:57:34][M] 07 - added new sub site***
[2014-09-05 11:58:59][M] 0-10 - ajax actions***
[2014-09-05 11:58:59][M] 07 - added new sub site***
[2014-09-05 12:29:58][M] 02 - sending request - url=http://www.annesophieduval.com/ASD/en/wp-admin/admin-ajax.php?action=user_sync_api;;***
[2014-09-05 12:30:00][M] 03 - sending request - response=

bc77e7b0d39e6d57235e1e3e098e1520;;***
[2014-09-05 12:30:00][M] 06 - checking key false;;***
[2014-09-05 12:31:14][M] 02 - sending request - url=http://www.annesophieduval.com/ASD/en/wp-admin/admin-ajax.php?action=user_sync_api;;***
[2014-09-05 12:31:16][M] 03 - sending request - response=

1ee2dfb8a248e08a057110b7b66f79d8;;***
[2014-09-05 12:31:16][M] 06 - checking key false;;***
[2014-09-05 12:32:11][M] 0-10 - ajax actions***
[2014-09-05 12:32:11][M] 07 - added new sub site***
[2014-09-05 12:33:44][M] 0-10 - ajax actions***
[2014-09-05 12:33:44][M] 07 - added new sub site***

Can you help me please !

sorry my english is very bad because i'm french girl.