网站现在无法打开，出现如下错误提示：
There appears to be an error:
Database error
------
SQL: SELECT UF.*,
MEM.uid, MEM.user_name, MEM.url_token, MEM.avatar_file, MEM.reputation, MEM.agree_count, MEM.thanks_count, MEM.url_token,
MEB.*
FROM aws_user_follow AS UF
LEFT JOIN aws_users AS MEM
ON UF.friend_uid = MEM.uid
LEFT JOIN aws_users_attrib AS MEB
ON UF.friend_uid = MEB.uid
WHERE fans_uid = 1 AND MEM.uid > 0 AND (MEM.group_id <> 3 AND MEM.forbidden = 0) ORDER BY UF.add_time DESC LIMIT 100
Error Message: Mysqli prepare error: Unknown column 'MEM.url_token' in 'field list'
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