What vb version are you running?
You are missing a table for blogs. Download vb files again upload them and run the upgrade.php should reinstall the missing table. But first if you have a backup would be better to try that first.
If 4.2.2 run this
admincp/
Maintenance/Execute SQL Query
Code:
ALTER TABLE `blog_user`
ADD COLUMN `entries` int(10) UNSIGNED NOT NULL DEFAULT 0 AFTER `lastblogtextid`;