升级到Discuz! X2 R20120329最新版后，备份数据出现错误！！！

我现在用的是Discuz! X2 R20120329最新版本，今天备份数据的时候，在备份完时，不提示备份成功，而出现错误页面。提示如下：

Discuz! Database Error The database has encountered a problem. Need Help?

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Error messages:

• [Type] 查询语句错误
• [1194] Table 'common_member_field_forum' is marked as crashed and should be repaired
• [Query] SELECT * FROM common_member_field_forum LIMIT 43385, 300
  

Program messages:

• [Line: 0059]admin.php(require)
• [Line: 0200]source\admincp\admincp_db.php(sqldumptable)
• [Line: 1109]source\admincp\admincp_db.php(DB::query)
  
  
  请教大家，这样的问题是什么原因，该怎么解决？谢谢大家！