1 orphaned users found, synchronizing them with a default profile

Hello

I have a problem with EasySocial installation.
The installation freeze at step 5.
I have the same message that is repeated endlessly.

1 users found orphaned, synchronizing em with a default profile.
1 users found orphaned, synchronizing em with a default profile.
1 users found orphaned, synchronizing em with a default profile.
1 users found orphaned, synchronizing em with a default profile.
1 users found orphaned, synchronizing em with a default profile.
1 users found orphaned, synchronizing em with a default profile.
1 users found orphaned, synchronizing em with a default profile........

So, some plugins are not installed.
I can't upload photos for example.

Thank you for your help.
Philippe


My Configuration :
Joomla 3.3.0
EasySocial 1.2.16
PHP 5.4.28