Looks like you tried following the below tutorial, but didn't import the database file.
www.joomlapolis.com/support/tutorials/107-use-cases/18377-configuring-a-country-field-with-cb-query-field-plugin
So you've a query field trying to query a table that doesn't exist. Note if you've CBSubs it's possible to use its database table instead of the one provided in the tutorial. For example you'd have a query field as follows if CBSubs Tax is installed as its geolocation tables are needed.
Field Type: Query Drop Down (Single Select)
Query:
Code:
SELECT `country_iso_code3`, `country_name`, country_region FROM `#__comprofiler_countries` WHERE `country_region` != '' ORDER BY `country_region`, `country_name`
Value Column: country_iso_code3
Label Column: country_name
Group Column: country_region