SYMPTOM:
In Strategy Developer, when you right click on the project and go to "Duplicate Project" you will be asked to select the source project location and the credentials to connect to that location as shown below.

On this screen, if the credentials used are that of a LDAP user imported in Strategy, users may get the following error message after pressing "Next".

CAUSE:
This error message may appear because Standard authentication is disabled for the user.
ACTION:
The user should be modified to use Standard authentication. For this, go to that particular user editor -> Authentication -> Metadata and uncheck the "User cannot use standard authentication to logon" checkbox as shown below.

This will allow the user to be used in Project Duplication.