[Click] schedule timeout error

[David Fuste]

Hello!
I am developing a special forwarding table with two timeouts.
Sometimes, when I run the click configuration in kernel mode, I get this 
error message:
"schedule_timeout: wrong timeout value ec194514 from c69619a3"

Does someone know why?
I don't get always this message, only few times, but when it occurs, it 
hangs the PC!
Moreover,  I don't understand because it say "wrong timeout value" since 
I always call the schedule_at function with a timeval equals to 
"click_gettimeofday + N seconds".

Help?
Thank you!!