Can't set CI environment variables

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Description of the problem

Can't set CI environment variables. Error message shown: "There was an error fetching the variables."

Which Group/Project (with full path) is experiencing the issue?

https://gitlab.com/anthonygore/hl-adman/-/settings/ci_cd

Approximate date/time when the error occurred.

May 24th 2020 5pm GMT+7

Describe what you were doing right before the issue occurred.

Opened the site and tried to set CI env variable.