I just did the upgrade from 5.21 to 5.3 and am getting Hundred of e-mail error reports - all the same as listed below. I did follow the directions pretty well I thought and ran the upgrade.php file after coping all of the upgraded files over. Did I miss something here.....
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An error was encountered during execution of the query:
SELECT key_id FROM dmphpbb_sessions_keys WHERE user_id=2 ORDER BY last_login DESC LIMIT 1
The query returned with an errorcode of:
Table 'dmphpbb2.dmphpbb_sessions_keys' doesn't exist
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Thanks!