Confluence CLI command fails with JAVA remote error

[Kota Sreenivasa Shravana Kumar]

Greetings 

I am using the following cli command to retrieve the users from a group in confluence. It works fine for some groups and throws error for others. 

confluence.sh --action getUserList --group "confluence-users" --server <confluence server> --user <confadmin> --password <confadminpassword>

The error message is as follows. Any pointers to resolve this issue would be helpful. 

Remote error: java.lang.NullPointerException: null

[Domenico Manzo [Actonic]]

Do you have any other User Directory except "Confluence Internal Directory" ?

[Kota Sreenivasa Shravana Kumar]

Our confluence is integrated with windows Active Directory. 

[Domenico Manzo [Actonic]]

So requests of which groups throws exception? Only internal or only AD ?