How to create custom collection?

Hi,

When I try to create a custom Collection I receive the following error:

"Object not set to an instance of an object"

I need the custom collection to link it to an Autocomplete Textbox.

How do I create a collection?

I haven't found any guide to create an autocomplete textbox. Can anyone help me please?

I'm using One Identity Manager 8.1.5.

Thanks in advance.

Regards,

Giuseppe