Seams like a database query related to CB Paid Subscriptions somewhere is trying to check for plan_id, but doesn't exist in whatever database table is being queried. Enable debug mode and maximum error reporting in Joomla global configuration then retry and see if it outputs more details about where the error is coming from specifically.
Do you have any CB Query Field or CB Auto Action usages querying CB Paid Subscriptions tables?
Kyle (Krileon)
Community Builder Team Member
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krileon
