Error: Virtual mailbox loops, Dovecot version 2.2.10

[dan at redchops.com]

I'm trying to follow the guide at 
https://wiki.dovecot.org/Plugins/Virtual for the 'Conversation' style 
virtual mailbox, but with a small change. I'd like the virtual mailboxes 
to be 'top level', which I found while searching through this list is 
accomplishable by putting the dovecot-virtual file in the root of the 
namespace location. My issue is this works perfectly fine for the All 
Mail virtual mailbox, but the Threaded mailbox fails with the error 
above. I tried creating a RealMail namespace, but that doesn't solve the 
issue either. I feel like I must be overlooking something simple; I 
could get this setup working if the virtual mailboxes shared a namespace 
and were subfolders, but I don't like that setup much (I'm trying to get 
my companies GMail users on to our own webmail client, it's features 
like this that I need to replicate with dovecot or they'll never leave 
their POP3 setups).

I've attached the output of dovecot -n, and my virtual mailboxes look 
like this:

# cat Threaded/dovecot-virtual
All
  inthread refs x-mailbox INBOX

# cat all/dovecot-virtual
RealMail
RealMail/*
-RealMail/Trash
-RealMail/Trash/*
-RealMail/Spam
-RealMail/Spam/*
   all

I'd appreciate any insight in to this issue. If I try to access the 
Threaded Inbox through IMAP, I get this error specifically:
a select "Threaded Inbox"
a NO [SERVERBUG] Virtual mailbox open failed because of mailbox All: 
Internal error occurred. Refer to server log for more information. 
[2017-04-03 00:24:28]

The relevant line being: Apr  3 00:24:28 mail dovecot: 
imap(dan at redchops.com): Error: Virtual mailbox loops:
No information before or after.

Thanks,
-Dan
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