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Probably the website your resource pack is hosted on or the resource pack itself is broken
What's the url of your server resource pack set on the options page.
https://download.nodecdn.net/c…d4806a984a40de2496f61.zip
BTW.Its resource pack for data pack
So the download seems to be fine so the problem might be related to the pack itself. Unfortunately I can not really help you with that.