[imp] Database error (HordeDB): Invalid SQL

[Felipe Stuardo]

sorry but my english es very bad...
but i have a problem and i don't know what i can do
when i open my web mail (https://mailserver.uca.edu.py) with
horde/imp/mysql i have this messages:

Database error (HordeDB): Invalid SQL: replace into active_sessions (
sid, name, val, changed
) values ('842b672bb8345fe389e7f726bbb185b6', 'HordeSession',
'SG9yZGVTZXNzaW9uOiR0aGlzLT5pbiA9ICcwJzsgJHRoaXMtPnB0ID0gYXJyYXkoKTsg',
'20021116113107')
Database error (HordeDB): Session: freeze() failed.

what happen? what i can do?
my mail is fstuardo@uca.edu.py

thanks.
felipe