ldap javaaction

hi experts,   I implemented the LDAP Synchronization module and I have "Test Connection" and received the "Connection established" message. I have also tried the "Test Authentication" and received the "Successful!" message, also I have imported the User groups.   But when I tried to Click Refresh to load this list from the LDAP server I faced a popup issue containing this error (Failed to find any attributes. Please enter attribute names manually). also when I tried to create a Custom attribute mapping always the (select new) dropdown field empty    
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