Order by not working on pythonanywhere

[gedionabebe]

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My django app's order_by_child filter has stopped working since I deployed it on pythonanywhere, I've tested it locally and it works fine but once deployed it throws an error "[Errno 400 Client Error: Bad Request for url: .......] { "error" : "orderBy must be a valid JSON encoded path" }" when ever it encounters order_by_child. Any solutions?