doveadm deduplicate commands

[Kevin Laurie]

Hello,
I just migrated my emails from gmail using getmail.
In the process I got some emails that have been doubled or tripled
How do I run the doveadm command to delete copies of same emails?

I tried running the following:-
doveadm deduplicate -u user at domain.net inbox

but I get error:-
doveadm(root): Fatal: Unknown argument INBOX

Could someone share some way to automatically remove duplicated messages?

Thanks
Kevin