zabbix3.2版本升级到zabbix3.4版本后打开页面报错，报错内容如下
Database error
The frontend does not match Zabbix database. Current database version (mandatory/optional): 3020000/3020000. Required mandatory version: 3040000. Contact your system administrator.
解决办法：
进入数据库
mysql> show databases;
mysql> use zabbix;
mysql> update dbversion set mandatory=3040000;
mysql> flush privileges;
重新打开web即可解决
