I have been trying to import a users xml file (exported from 2.2.2) into a fresh install of OJS (2.4.2).
Whenever I try to import, of around 400 users, only 48 are being imported and the following resultant error message is displayed:
"DB Error: Column 'first_name' cannot be null".
There are no user names with blank first names. A validation check identifies 113 errors. It is not clear what the error message means (this is a sample of the error message from http://www.validome.org/
Line File name: users.xml
28 Column: 3137
Error: Content of element type "user" must match "(username?,password?,salutation?,first_name,middle_name?,last_name,initials?,gender?,affiliation?,signature?,email,url?,phone?,fax?,mailing_address?,country?,interests*,biography*,locales?,role*)".
Any help would be appreciated