Unknown column 'use_2co' in 'field list'

If you reinstalled and you still have this error, then there’s a DB problem preventing the creation. The best thing to do here:
– activate the plugin
– select the option “Delete all EME data when upgrading or deactivating?”
– deactivate the plugin
– activate the plugin again

This isn’t a viable option. There’s a voluminous amount of data that would be lost. Is there a way to export the existing data and then import after a “Delete all” is executed?

Or can I just manually create the missing field in the MySQL DB?

Yes you can do it manually:

alter table XXXX add use_2co bool DEFAULT 0;

XXX is the name of the events table, by default: wp_eme_events

Did that. Edited an event. Now I’m getting this:

WordPress database error: [Unknown column 'use_webmoney' in 'field list']

Also: The field(s) that I’m adding: Should they be specified as NULL or NOT NULL?

Disregard; I rolled back to a backup version of the DB, deactivated and reactivated the plugin & it works now.

Thanks for the assistance.

Well yes, after the use_2co field, other database fields have been added. But apparently after the rollback the database fields were successfully added, so maybe some hickup there? Your DB logs might provide a clue.