一、问题描述 centos7启动mysql报错 [root@bigdata01 ~]# systemctl start mysqldJob for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journa
学习笔记 1.ios自动配控件 学习过程中app出现这个错误 Terminating app due to uncaught exception ‘NSUnknownKeyException’, reason: ‘[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key myB