doveadm deduplicate commands

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@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