[Evolution] "Empty cache file" errors

[Andrea Vai <andrea vai unipv it>]

Hi all,
I am new to the list, I have subscribed recently to address some
problems that I experience with evolution. The current problem has
raised after upgrading from Ubuntu Trusty to Utopic (that is, from evo
3.10.4 to 3.12.10 which is my current evo version): sometimes the error
message "Empty cache file" comes up.

I have found some talks about this problem on this list some time ago,
but they were not enough clear to me to understand and solve my problem.

Unfortunately, I am not able to say under which circumstances the error
appears: sometimes when a message arrives, or perhaps when I move a
message from one folder to another (but I cannot say it for sure).

When the error comes up, the error message can vary and here are some examples:

Error during the execution of the operation.
Empty cache file: /home/andrea/.cache/evolution/mail/1274249661 2157 26 
andrea-desktop/folders/INBOX/cur/12/46230

Error during the execution of the operation.
Execute of filter «Mail to myemail mydomain com» not succeded: Empty cache file: 
/home/andrea/.cache/evolution/mail/1274249661 2157 26 andrea-desktop/folders/INBOX/cur/12/46231

Error during «Download of new messages for off-line mode».
Empty cache file: /home/andrea/.cache/evolution/mail/1274249661 2157 26 
andrea-desktop/folders/INBOX/cur/11/46228

Error during «Unknown background operation».
Execute of filter «Mail to myemail mydomain com» not succeded: Empty cache file:  
/home/andrea/.cache/evolution/mail/1274249661 2157 26 andrea-desktop/folders/INBOX/cur/12/46236

Error during the execution of the operation.
Execute of filter «Mail to myemail mydomain com» not succeded: Empty cache file: 
/home/andrea/.cache/evolution/mail/1274249661 2157 26 andrea-desktop/folders/INBOX/cur/12/46239

Error during «Download of new messages for off-line mode».
Empty cache file: /home/andrea/.cache/evolution/mail/1274249661 2157 26 
andrea-desktop/folders/[Gmail]/subfolders/Posta inviata/cur/2a/23647

Error during «Filtering new message in «INBOX»».
Execute of filter «Mail to myemail mydomain com» not succeded: Empty cache file:  
/home/andrea/.cache/evolution/mail/1274249661 2157 26 andrea-desktop/folders/INBOX/cur/14/46252

Error during «Filtering new message in «INBOX»».
Execute of filter «Mail to myemail mydomain com» not succeded: Empty cache file:  
/home/andrea/.cache/evolution/mail/1274249661 2157 26 andrea-desktop/folders/INBOX/cur/16/46273

I have double checked my filtering rules, and does not seem to be anything bad in them (btw, all used to work 
fine with these rules, before the upgrade).

Sorry for my english, and also keep in mind that error messages are
translated from italian by me, so can't be sure that they correspond
literally to the english ones.

Thank you very much for your help,

Best regards
Andrea Vai

Evo 3.12.10 on Ubuntu 14.10