751e44c4__Error_Codes___ServiceNow_Wiki__Description
[Error / Data Code] 65 [Error] LDAP_OBJECT_CLASS_VIOLATION [Description] 
Indicates that the add, modify, or modify DN operation violates the object class rules for the entry. For example, the following types of request return this error: The add or modify operation tries to add an entry without a value for a required attribute. The add or modify operation tries to add an entry with a value for an attribute which the class definition does not contain. The modify operation tries to remove a required attribute without removing the auxiliary class that defines the attribute as required.
LDAP Error Codes - ServiceNow Wiki
Description