user warning: Unknown column

Using the 6.x-1.x-dev snapshot from 2011-Feb-25. Version of Views is 6.x-2.16.

Attempting to sum values in a field shared among several content types.

Error message:

user warning: Unknown column 'node_data_field_event_cup_hours.field_event_cup_hours_value' in 'field list' query: SELECT NULL AS users_signup_log_uid, NULL AS users_signup_log_name, NULL AS node_signup_log_title, NULL AS node_signup_log_node_data_field_event_date_field_event_date_value, NULL AS signup_log_attended, NULL AS node_signup_log_node_data_field_event_cup_hours_field_event_cup_hours_value, SUM(node_data_field_event_cup_hours.field_event_cup_hours_value) AS SUM__node_signup_log_node_data_field_event_cup_hours_field_event_cup_hours_value FROM users users LEFT JOIN signup_log signup_log ON users.uid = signup_log.uid LEFT JOIN node node_signup_log ON signup_log.nid = node_signup_log.nid LEFT JOIN users users_signup_log ON signup_log.uid = users_signup_log.uid LEFT JOIN content_field_event_date node_signup_log_node_data_field_event_date ON node_signup_log.vid = node_signup_log_node_data_field_event_date.vid LEFT JOIN content_field_event_cup_hours node_signup_log_node_data_field_event_cup_hours ON node_signup_log.vid = node_signup_log_node_data_field_event_cup_hours.vid WHERE users_signup_log.uid = 630 in /htdocs/drupal/drupal-6.19/sites/all/modules/views/includes/view.inc on line 814.

I've seen several other issues opened and closed on this error message but it was unclear to me how one might solve the problem. Thanks.