Installation failed on my site

When I go to Subscriptions/User Defaults, I get this rather worrying warning message:

# user warning: Unknown column 'module' in 'field list' query: SELECT module, field, count(1) as number FROM subscriptions WHERE recipient_uid = -2 GROUP BY module, field in /Users/Zubin/MAMP/GDP22/includes/database.mysql.inc on line 172.
# user warning: Table 'gdp22.subscriptions_user' doesn't exist query: SELECT uid, digest, send_interval, send_updates, send_comments, send_interval_visible, send_updates_visible, send_comments_visible, autosub_on_post, autosub_on_update, autosub_on_comment, send_self FROM subscriptions_user WHERE uid in (-2, -2) ORDER BY uid in /Users/Zubin/MAMP/GDP22/includes/database.mysql.inc on line 172.
# warning: Invalid argument supplied for foreach() in /Users/Zubin/MAMP/GDP22/sites/all/modules/subscriptions/subscriptions.module on line 500.
# user warning: Table 'gdp22.subscriptions_user' doesn't exist query: SELECT uid, digest, send_interval, send_updates, send_comments, send_interval_visible, send_updates_visible, send_comments_visible, autosub_on_post, autosub_on_update, autosub_on_comment, send_self FROM subscriptions_user WHERE uid in (-2, -2) ORDER BY uid in /Users/Zubin/MAMP/GDP22/includes/database.mysql.inc on line 172.

It goes on, repeating the last warning.

Any ideas?