Sorting not works in my new report

I created new report with Data Source - Emails. And I can’t sort my report by field “COUNT Created by”. Mautic v2.10.0.

Help me to fix this please.

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Report config:

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I created new report with Data Source - Emails. And I can’t sort my report by field “COUNT Created by”. Mautic v2.10.0.
Help me to fix this please.

Report config: