can't add a second kojibuilder host,

[dust]

i have installed kojihub, kojibuilder, kojira on my koji server(hostname is 186),   and regen-repo successed.


$ koji regen-gen dist-fc10-build  
  //task return complete


now i want add a second kojibuilder(hostname is 188),  but regen-repo failed.
$ koji list-hosts --channel=createrepo
Hostname                     Enb Rdy Load/Cap Arches           Last Update
kojibuilder1                 Y   Y    0.0/16.0 i386             2010-01-20 18:05:21
kojibuilder2                 Y   Y    0.0/16.0 i386             2010-01-20 18:05:20


$ koji regen-host dist-fc10-build
  //task return failed.


search /var/log/kojid.log
---
[WARNING] koji.build.TaskManager: Repo directory missing: /mnt/koji/repos/dist-fc10-build/7
---


can anybody help me  how to fix the failed.
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