How to run mumi locally?

[宋文武]

Hello, I try to run mumi locally on guix system with:
--8<---------------cut here---------------start------------->8---
    (service mumi-service-type
             (mumi-configuration
               (mailer? #f)))
--8<---------------cut here---------------end--------------->8---

But then curl localhost:1234 return a empty reply.


In /var/log/mumi.worker.log there are errors:
--8<---------------cut here---------------start------------->8---
2023-02-01 13:10:26 Starting full indexing.
2023-02-01 13:10:26 worker error: (system-error open-file ~A: ~S (No such file 
or directory /var/mumi/data/spool/index.db.realtime) (2))
2023-02-01 13:10:26 worker error: (system-error open-file ~A: ~S (No such file 
or directory /var/mumi/data/spool/index.db.realtime) (2))
--8<---------------cut here---------------end--------------->8---

I think this means I have to get debbugs data (index, log, or maildir?)
files somehow.  How to do it?  Thank you!