Unable to add member to an LDAP Group

Hello ,

I am trying to assign LDAP Account to an LDAP group , the user is added to group properly in One Identity Manager ,  but the member is not getting added in the LDAP, 

the User account and Group are present in LDAP.

I am getting the below error,

[1777239] The mapping rule (GroupMembers) was unable to execute synchronization between system objects (AGROUPEXAMPLE9) and (GROUPEXAMPLE9) successfully!

[1777396] Could not create matching member system objects for the other side of the target system for the following system objects:pran

if any one have any ideas please let me know