The error of displaying the countdown when using a custom time format

Grafana Dashboards
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Hi! I am using Grafana v10.0.1 on Ubuntu 20.04.2 LTS.

I’m trying to set up a countdown using the grafana-clock-panel plugin v2.1.9. The settings are shown in the screenshot.

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I am getting the error “Invalid language tag: en-weekStart”. In the dashboard settings, the Week start parameter is set to Monday. It works fine without a custom time format.

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Can anyone help me with this?