I can't adding variables when I select zabbix source


I’m a noob with grafana,

I wanna use Grafana + Zabbix, and I already setting Datasource to connect my zabbix server

and now I want add variables but I can’t,

it always show black page,

I don’t know what happend about this,

maybe I lack some step, following below this gif


I hope have someone can help me,

Thank you

I try use olde version 6.7.3

It works!

doesn’t have this problem with version 7

-sorry my english not well