Error: namespace configuration error: There can be only one namespace with inbox=yes

[ssgill]

Hello started getting this error

Error: namespace configuration error: There can be only one namespace with inbox=yes

No changes were done to dovecot configuration and it was working fine.
It's standard setup with configuration override in conf.d file

To get it working i had to comment out
inbox = yes

No other file in this folder have this defined. Its been working like this for past couple of months and this morning started getting error.

doveconf -S

namespace=inbox 1
namespace/inbox/name=inbox
namespace/inbox/type=private
namespace/inbox/separator=.
namespace/inbox/prefix=
namespace/inbox/location=
namespace/inbox/inbox=yes

90-special-folders.conf

# default namespace
namespace {
separator = .
prefix = INBOX.
# inbox = yes
type = private
list = yes
subscriptions = yes
######### Auto create folders and subscribe ##########
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Junk {
auto = subscribe
special_use = \Junk
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
mailbox name {
special_use = \Drafts \Junk \Sent \Trash
}
######### End ########################################
}