[imp] IMP : deleting mail failed

[Bruno Costacurta]

Hello,

I just installed and configured Horde and IMP.
I'm able to retrieve emails but as I tried to delete an email I receive
following error message :

This request cannot be completed because the link you followed or the form
you submitted was only valid for 0 minutes. Please try again now.

Used version are :

horde-3.3.4
imp-h3-4.3.4

Thanks for any help or advice.
Bye,
bruno