[Evolution] Problem with calendar an tasks

[Erwin Kaatz <ekaatz micromax com py>]

whenever I open de the calendar or tasks I get this message
Unable to open folder '/home/user/evolution/local/Tasks/tasks.ics'
and 
I cant open the folder in 
'file:///home/user/evolution/local/Calendar/calendar.ics'

Then if I create an entrance in the calendar and save it as
calendar.ics, I still get the 
same problem if I close the program and open it again

It doesn't work either when I put save and close, I get the message "I
can't save the objetc" 

what can I do?

I am using ximian evolution 1.0

the error messages are translated from spanish to english 
so I don't know if those would be the exact words


regards
Erwin Kaatz