That's odd. sess_ID should be in evo_sessions.

Though the error message seems strange the importer looks like it was designed to import Wordpress 2.3 databases into b2evolution. Importing 2.5 database might give you problems.

If you can can you check what is currently in your b2evolution database? Specifically did you run the installer and were all the database tables created correctly? What is the table structure of evo_sessions?

Thanks for your reply Ian. Yes, sorry, I should have said before, I used the installer in the back office. All the tables were created correctly. The table structure in evo_sessions is:

Table structure for table evo_sessions
Field...Type..........Null.... Default
1....... char(1)....... No..... a
2....... char(1)....... No..... a
3....... char(1)....... No..... a
4....... char(1)....... No..... a
set.....char(1)....... No

Dumping data for table evo_sessions
1....... 2....... 3....... 4....... set

hmm, that's doesn't look right. If I get this right, the field names are 1, 2, 3, 4? There aren't any fields like sess_ID, sess_data, sess_ipaddress ... ?

Did you copy and paste this from phpMyAdmin? Where did you get this table structure?

You could try deleting your b2evolution database and starting over again.