Error: User bob at aaa.bbb doesn't have home dir set, disabling duplicate database

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I made a mistake when I moved dovecot to a new server and only specified 
mail_location instead of mail_home

All I have in 10-mail.conf is

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mail_location = maildir:/home/vmail/mailboxes/%d/%n

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All emails for the few accounts I have are in these mailboxes and I can 
get/see them via my mail client

I do, however, get the following error

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imap(bob at aaa.bbb): Error: User bob at aaa.bbb doesn't have home dir set, 
disabling duplicate database

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After looking at https://wiki2.dovecot.org/VirtualUsers/Home I tried the 
following

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mail_home = /home/vmail/mailboxes/%d/%n

mail_location = maildir:~/mail

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Problem with this is that I now can't see any of my emails in the client.

Appreciate any help on how to fix this.

Thanks