请教我新装的4.6.0,为什么文章post后会出现一个下面的页面?尽管文章已存储

user error: Access denied for user: xxx@localhost' to database 'xxx'
query: LOCK TABLES sequences WRITE in /drupal/includes/database.mysql.inc on line 66.
warning: Cannot modify header information - headers already sent by (output started at /drupal/includes/common.inc:384) in /drupal/includes/common.inc on line 192.

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