File write error: [object Object]

[slrslr]

v. 0.6.0 rev3177
Windows 10
Latest FIrefox

i tried to publish comment at http://127.0.0.1:43110/zeroblog.bit, but getting errors "File write error: [object Object]". Already tried to delete site and revisit, reload page.
At other blog commenting works good.

The console shows these errors:

[17:57:35] Site:1ZeroA..D7YH data/users/1L4dZcD***/data.json fileGet error: [Errno 2] No such file or directory: u'data/1ZeroABd9***/data/users/1L4d***/data.json'
[17:57:35] Site:1ZeroA..D7YH FileWrite forbidden 1L4dZcD*** not in valid_signers [u'1ZeroABd9***']