It seems like that is a field that was left over by a version that was from 1.1. I've manually removed it through your database and the error message won't show up now.
I am really sorry for the delay of this reply as it is a weekend for us here. http://stackideas.com/forums/do-not-upgrade-to-easysocial-1-3-9
We have just found a major issue in EasySocial 1.3.9 and it would actually delete your friends connections table due to a bug in the SQL query. Kindly please do not upgrade to 1.3.9 and upgrade to 1.3.10 directly.
please contact us at https://crm.stackideas.com and provide us with the backups and we'll help you perform the restore of the tables.
Again, I sincerely apologize for the inconveniences caused.
I am really sorry for the delay of this reply as it is a weekend for us here. If you do not have any backups, it could be problematic because there's no way to restore these "friend connections".
If the users re-send friend requests, it will work