Are you responsible for making OJS work -- installing, upgrading, migrating or troubleshooting? Do you think you've found a bug? Post in this forum.
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We have a database of 300 delegates in OCS. Recently, we try to export that OCS database of users to OJS and keep on getting error "OJS DB Error: Column 'last_name' cannot be null". Can someone help please?
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Are you doing a direct database conversion (i.e. right from your OCS MySQL to your OJS MySQL)?
The message suggests that you're trying to insert a value into the users table without supplying a value for the last_name column, which requires a value.
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