后台更新缓存时出现UCenter info: MySQL Query Error提示

更新缓存时提示如下信息：

UCenter info: MySQL Query Error
SQL:SELECT * FROM [Table]notelist WHERE closed='0' AND app1<'1' AND app1>'-5' LIMIT 1
Error:MySQL server has gone away
Errno:2006

截图：


求解决，谢谢！